Hanauma Bay Nature Preserve is a protected marine area on Oʻahu’s southeastern coast, about 10 miles east of Waikīkī. The crescent-shaped bay formed in a collapsed volcanic crater, and its shallow inner reef gives beginners a chance to snorkel among tropical fish. Strong swimmers can explore farther out, where the reef and marine life are more varied. Entry includes an educational film about protecting the bay. Reserve a time in advance, then arrive early enough to park and reach your entry slot.
A volcanic bay protected for marine life
Hanauma Bay formed when a volcanic crater collapsed, leaving a curved bay on Oʻahu’s southeastern coast. The preserve lies offshore from Hanauma Bay Beach Park, about 10 miles east of Waikīkī.
The area became a protected marine life conservation district in 1967 and is also a state underwater park. Its reefs provide habitat for tropical fish and other marine life, including green sea turtles. Visitor numbers are limited to help protect the bay; one published account gives the daily limit as 720 people.
Snorkeling from the inner reef to the outer reef
The shallow inner reef is suited to beginners and families looking to see tropical fish close to shore. Farther out, the outer reef has clearer water and living coral formations, but it is a better choice for strong swimmers. Conditions differ across the bay: the left side is recommended only on calm days.
Stay off the rocks and coral while exploring. Reef-safe sunscreen or a long-sleeved swim shirt helps you protect your skin without relying on sunscreen alone.
Reservations and arrival
Reserve an entry time at least 48 hours ahead, since tickets can sell out. Arrive at least 30 minutes before your slot to allow time to park and get to the entrance. Parking costs $3 and is cash only; the parking area can fill early.
An educational film about wildlife protection is part of the entry process. The preserve is closed on Mondays and Tuesdays, giving marine life a break from visitors. It is open Wednesday through Sunday.
FAQ
Do you need a reservation for Hanauma Bay?
Yes. Reserve at least 48 hours ahead; entry slots can sell out. Arrive at least 30 minutes before your reserved time.
How much does parking cost?
Parking costs $3, payable in cash.
Which days is Hanauma Bay closed?
The preserve is closed on Mondays and Tuesdays. It is open Wednesday through Sunday.
Where is the best area to snorkel?
The shallow inner reef suits beginners. The outer reef on the right has clearer water and coral formations and is better for strong swimmers.
