Hanauma Bay
Oahu · 1-4 m · often 10-20 m · ticketed mornings
A flooded volcanic crater and MLCD. Timed tickets, a video brief, and closed days manage the crowd that made the bay famous.
Darker cells mean a higher score for this topic on that metric.
Accessibility62
Skill ceiling64
Gear load48
Risk54
Seasonality38
Wow factor88
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Quick answers
Which local rescue or training agency should I check first?
Use the local lens: coastguard/federation norms and the shop briefing for that bay — not a blog visibility claim.
What is Act 104?
A 2018 Hawaii statute targeting sunscreen ingredients such as oxybenzone and octinoxate. Long sleeves work regardless of the chemistry debate.
Molokini?
A crescent tuff cone off Maui. The inner crater is the classic boat-snorkel; the back wall is a current dive. Morning trips are the culture.
Kealakekua Bay?
A marine life conservation district on Hawaii Island, reached by boat or a steep trail, famous for clear water and a monument shore. Theft and heat on the trail are real.
Kona manta nights?
A sit-dive or snorkel around lights that attract plankton, then mantas. Codes limit touching and light-in-eyes. See night-diving.
Is Two Step a real name?
Yes: a lava-entry snorkel at Honaunau near the Place of Refuge, popular and sharp on the ankles.
These are famous, mapped sites. Wind and swell change; towers and boats publish the day. Depths are typical published bands, not a live plan.
A ticketed or towered shallows is the correct first Hawaiian water.
Points
Molokini Crater (inner)
Maui · 2-10 m · often 15-30 m · morning trips
A crescent tuff cone. The inner crater is the classic boat-snorkel; the back wall is a current scuba site, not a first snorkel.
Kealakekua Bay
Hawaii Island · 2-15 m · often 15-25 m · morning calm
A MLCD with a monument shore, reached by boat or a steep trail. Clear water, boats, and heat on the land route.
Two Step (Honaunau)
Hawaii Island · 1-8 m · often 10-20 m · morning
A lava-ledge entry near Pu'uhonua o Honaunau. Ankles and urchins are the local tax; coral is close.
Cathedrals (Lanai)
Lanai · 10-20 m · often 15-25 m · boat days
Lava caverns and light rays, typically a Maui-or-Lanai boat scuba. Overhead-adjacent; a guide and a brief, not a snorkel.
Shark's Cove
North Shore Oahu · 1-6 m · variable · summer calm
A rocky tide-pool and cove that is a summer snorkel and a winter close-out. The name is folklore; the swell is not.
Kahe Point (Electric Beach)
West Oahu · 3-12 m · often 10-20 m · calm mornings
A power-plant outflow that concentrates fish and snorkellers. Current and a working-industrial shoreline; not a wilderness bay.
Kona manta night sites (Garden Eel / Keauhou)
Hawaii Island · 8-12 m sit · night · calm nights
Lights, plankton, mantas. A sit-dive or snorkel product with tightening no-touch codes. Wind cancels. See night-diving.
Tips
- Reserve Hanauma — Walk-up disappointment is the alternative.
- Inner crater, not the back wall — Molokini's two personalities.
- Trail water and shade for Kealakekua by land — The bay is only half the site.
- Manta codes or skip the night — The animal is the product.
Hawaii is a ticketed crater, a few lava steps and a night that must stay gentle. The North Shore in winter is a different chapter.