Photo: Brocken Inaglory, CC BY-SA 3.0Spinner dolphins pass the lava-ledge coves, and after dark giant manta rays swoop through your lights on a night snorkel. A bay with a monument can be reached only on foot or with a permitted guide. The sunny Kona and Kohala coasts are where you swim.
Put your face in the water on the Big Island and you see steep reefs, clear water and big animals, not wide sandy lagoons. This is a young island with a black lava coastline. Most people swim on the dry west side, Kona and Kohala, where the mountains block much of the trade wind and rain. The water is often calm and clear.
The signature trip is the manta ray night snorkel off Kona. You float at the surface above a light board while reef manta rays feed on plankton below you. By day, Kealakekua Bay, Two Step at Honaunau and Kahaluu Beach Park offer coral, turtles and, in the right months, spinner dolphins. Farther north, Beach 69, Mauna Kea Beach and Puako are quieter Kohala options.
Hilo, on the east side, gets more rain and swell. Sheltered spots like Richardson Ocean Park and Carlsmith Beach Park still work on calm days. Many entries are over lava rock, so bring water shoes and take your time at the edge.
Tap a spot to see what it is like, then open its guide or get directions.
Tap a card for spotting tips and the Guardian rule for each animal. Filter by what you most want to meet.
The turtle you are most likely to meet. Greens graze on algae over shallow reef and rest under ledges. In Hawaii they are protected and very used to snorkelers.
Spotting tip: Scan the rocky edges where waves wash over algae, and sandy cleaning stations where fish pick at their shells.
Guardian rule: Stay at least 10 ft away. Never block a turtle's path to the surface.
Chelonia mydas
Gentle filter feeders with wingspans that often reach 10 to 12 ft. Off Kona, lights draw plankton at night and the mantas glide up to feed just below snorkelers.
Guardian rule: Float at the surface, keep your legs up and never touch a manta. Touching removes the protective mucus on its skin.
Mobula alfredi
Slender dolphins famous for leaping and spinning. They rest in calm Hawaiian bays by day after feeding offshore at night, which is why the law protects their daytime rest.
Guardian rule: Federal law bans swimming with or approaching spinner dolphins within 50 yards in Hawaii.
Stenella longirostris
A bright lemon-yellow surgeonfish that grazes algae in loose schools. It is one of the easiest Hawaiian reef fish to spot, especially along the Kona coast.
Zebrasoma flavescens
Colorful grazers with fused, beak-like teeth. You can hear them crunch on coral rock, and much of the white sand on tropical beaches passes through them.
Scaridae
A striking black, white and yellow fish with a long trailing fin, often seen in pairs or small groups over Pacific reefs.
Zanclus cornutus
A bumpy, branching coral that grows in rounded heads on wave-washed Hawaiian reefs. It is often the first coral to bleach in marine heat waves.
Pocillopora meandrina
The big reef builder of Hawaii, forming rounded mounds and boulders that can be hundreds of years old. Many reef fish shelter around its heads.
Porites lobata
Full guideAfter dark, you float over a light board while reef manta rays loop and flip below. Boat trip from Keauhou or Honokohau, year round.
Full guideCoral, spinner dolphins and the Captain Cook Monument in a Marine Life Conservation District. Reach it by boat, guided kayak or a long hike.
Full guideA lava ledge by the Honaunau boat ramp drops you onto a steep reef with turtles and spinner dolphins in the bay. Booties help.
A calm lava-reef pond south of Kailua-Kona with easy entry and regular green sea turtles. Mind the current at the north end.
Beach access is free. Parking is paid for non-residents, and Hawaii residents with state ID park free. Amounts vary by source, so confirm on site. Directions
Calm Kohala bay near Puako with its best reef on the south side. The access road runs through resort property.
No fee listed in the sources checked. Confirm at the county before you go. Directions
Rocky points frame both ends of this white-sand Kohala beach, and that is where the snorkeling is best. The small public lot fills fast.
No fee listed in the sources checked. Public parking is limited, so arrive before 9 a.m. Directions
Tide pools and coves along Puako Beach Drive, with turtles in the water. Expect no facilities or lifeguards and a rocky outer reef edge.
No fee listed in the sources checked. Shoreline access points are along Puako Beach Drive. Directions
Hilo's best-reviewed snorkel bay sits sheltered by lava, with green sea turtles along the rocky edges. Entry is over lava, so booties help.
Free. Lifeguards are reported daily 9:30 a.m. to 4:45 p.m.; confirm current hours. Directions
A calm white-sand lagoon with freshwater seeps and anchialine ponds that green sea turtles visit. Reliable when the open coast is rough.
Free. Lifeguards are reported daily 9:30 a.m. to 4:45 p.m.; confirm current hours. Directions
Boat tours reach this reef-fringed bay just north of Kailua-Kona, away from the beach crowds. Some guides call it Magic Sands, but sources disagree.
No entry fee, but you need a boat tour. Prices vary by operator, check the Kona tours. Directions
A rugged 1.5 mile dirt road and a lava trail lead to these remote North Kona beaches. No lifeguards or water, so go only in calm seas.
Entrance and parking fees started January 2026 at the Maniniowali (Kua Bay) section. Fees for Mahaiula and Makalawena were not confirmed; one search result gave $5 per person plus $10 per vehicle for non-residents, free for residents with ID. Directions
Beginners snorkel the calm, shallow north cove of this long white-sand beach. Winter surf and shorebreak make it unsafe, so go on summer mornings.
Non-residents pay about $5 per person plus $10 per vehicle per search results, free for Hawaii residents with ID. The page opened lists fees only as 'may apply'; confirm with State Parks. Directions
Shore entries with easy parking and calm water on a normal day. Still check the surf and ask the lifeguard.
A lava ledge by the Honaunau boat ramp drops you onto a steep reef with turtles and spinner dolphins in the bay. Booties help.
A calm lava-reef pond south of Kailua-Kona with easy entry and regular green sea turtles. Mind the current at the north end.
Calm Kohala bay near Puako with its best reef on the south side. The access road runs through resort property.
Hilo's best-reviewed snorkel bay sits sheltered by lava, with green sea turtles along the rocky edges. Entry is over lava, so booties help.
A calm white-sand lagoon with freshwater seeps and anchialine ponds that green sea turtles visit. Reliable when the open coast is rough.
Calm Choppy Rough. Wave heights are offshore model values.
Loading tides…
Forecast: Open-Meteo. Tides: NOAA station 1617433. Model data, not a lifeguard report. Always check posted warnings.
by Dolphin Discoveries
Small-group rigid inflatable boat trip to the Manta Village feeding area, about 45 to 60 minutes in the water, with a naturalist safety briefing.
Pre-entry briefing covers no touching and non-nano zinc sunscreen; the operator says it uses a small-group format.
We may earn a commission when you book through these links, at no extra cost to you. It never changes which tours we pick. How we choose tours.
May to October usually brings the calmest water on the Kona and Kohala coasts. Winter still works there on most days, but northwest swell can close entries and the Hilo side is rougher.
Go in the morning. Wind and boat traffic build in the afternoon, and small parking lots at popular spots fill before 9 a.m.
Skip any site facing a big swell, and the Hilo side after heavy rain when runoff clouds the water.
| Row | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Snorkel conditions | Good | Good | Good | Good | Best | Best | Best | Best | Best | Best | Good | Good |
| Water °F | 79 | 79 | 79 | 80 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 80 |
Snorkeling in Hilo works on calm days at sheltered lava-rimmed parks. Richardson Ocean Park has the best reef of the Hilo beaches and regular green sea turtles, while Carlsmith Beach Park (Four Mile) has a calm lagoon that stays smooth when the outside coast is rough. Both report lifeguards daily 9:30 a.m. to 4:45 p.m. Hilo gets more rain than Kona, so pick a dry morning and skip it after heavy rain. The Kapoho tide pools are not included here because the 2018 lava flow destroyed them.
For first-timers, Kahaluu Beach Park is the easiest. For dolphins and ledges, Two Step and Kealakekua Bay. For something different, the manta ray night snorkel off Kona. In Kohala, try Beach 69, Mauna Kea Beach and Puako. Snorkel before 10 a.m. for the calmest water.
Hawaii state law and federal wildlife guidance apply on every Big Island beach.
Hawaii law bans the sale of sunscreen containing oxybenzone or octinoxate. It is a sales ban, so check the label of anything you bring from home, and prefer a rash guard. Official rule
Stay at least 10 ft from sea turtles, 50 ft from Hawaiian monk seals and 50 yd from spinner dolphins. Never touch or chase animals, including manta rays.
Every vessel, including kayaks, needs a State Parks transit permit. Permitted vessels may not land at Kaawaloa Flat or launch from Napoopoo wharf. Renters should confirm the owner's permit. Guided tours by permitted vendors are the way to reach the monument by water; hiking the Kaawaloa Trail is the other route. Official rule
How snorkelers protect reefs · Hawaii reef-safe sunscreen rules
These local groups restore coral, rescue wildlife and keep the water clean. Volunteer a morning, donate, or just follow their work.
Research and conservation of Kona manta rays
A Kailua-Kona nonprofit that studies manta rays and keeps the Kona Manta ID Catalog. It has supported tour participant guidelines and operator standards, and its website takes donations.
Visit mantapacific.org →Most visitors head to the Kona and Kohala coasts. Kealakekua Bay, Two Step and Kahaluu Beach Park are the classic daytime sites, and the manta ray night snorkel off Kona is the signature trip. Calm days matter more than any one spot.
Yes, on calm days. Richardson Ocean Park and Carlsmith Beach Park are sheltered by lava and often have green sea turtles. The east side gets more rain and swell than Kona, so check conditions and skip it after heavy rain.
Usually yes. Many entries are over lava rock, and Two Step has sea urchins in the ledge cracks. Water shoes protect your feet and let you enter without standing on coral.
What we pack for every snorkel trip. Each link searches the category on Amazon so you can compare brands and prices.
Non-nano zinc oxide only. No oxybenzone or octinoxate, which Hawaii bans.
Shop on Amazon →The best sun protection is fabric. Less sunscreen in the water, less sunburn on your back.
Shop on Amazon →A low-volume mask that fits beats any rental. Short travel fins pack easily.
Shop on Amazon →An inflatable vest lets you rest without standing on the reef. Lifeguards love them.
Shop on Amazon →As an Amazon Associate we earn from qualifying purchases. Disclosure.
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We check fees, rules and access against official sources first, then local operators and recent visitor reports. Conditions change, so always follow posted signs and lifeguards. Spotted something out of date? Tell us.
