1. Hanauma Bay is a popular marine nature reserve located on the island of Oahu in Hawaii. It is known for its crystal-clear waters and vibrant marine life, including over 400 species of fish. The horseshoe-shaped bay was formed within a volcanic crater and offers stunning views of the surrounding mountains and ocean.

2. Hanauma Bay is open from 6:00 am to 6:00 pm every day except Tuesday. The phone number for Hanauma Bay is (808) 396-4229.

3. All visitors to Hanauma Bay must purchase a ticket, which costs $7.50 for adults and $1 for children. Tickets can be purchased in advance online or at the entrance to the bay. Visitors can take a shuttle bus to the beach or park in the lot and walk down. It is also accessible by public transportation.