North of Kona and southwest of Waikoloa Village on the Big Island, the snorkeling at Anaehoomalu Bay (aka A-Bay) was known in the past to be good. However, there has been some damage to the beach and the visibility can be poor at times. The best snorkeling is along the right (north) side of the bay where you’ll find the Fingers dive site and the Turtles dive site. Also, the far left (south) side of the bay can be could if the surf and wind is low. During Anaehoomalu Bay snorkeling, you may encounter butterflyfish, green sea turtles and plenty of other reef fish.
To reach the snorkeling on the Big Island by air, you will need to fly into either Kona International Airport (KOA) on the south side of the Big Island and Hilo International Airport (ITO) on the northeast side of the Big Island. From either airport, the best bet is to rent a car since the dive sites are pretty far off the main roads. The best Big Islands snorkeling dive sites are spread around the island. The conditions at each dive site vary throughout the year depending upon winds and currents. Since many of the Big Island snorkeling destinations are open water and unprotected, make sure to check the current surf reports before heading to any of these dive sites. Luckily, there are excellent up-to-date surf reports that can provide guidance on these adverse conditions. With the usually rolling surf, it is strongly discouraged to use open-tube snorkels which are common at snorkel rental locations -- only use snorkels with a dry-top splash-guard and a sump purge-valve in the mouth piece.
Overall, Anaehoomalu Bay is the 2nd most popular snorkel dive spot of all 7 snorkeling dives in Big Island.