South of Lanai City, the snorkeling at Manele Bay is well known. In Manele Bay, there are coral beds along the sides of the bay near the cliffs. The bottom slopes off quickly here to 40 feet deep. There is a sand channel in the middle of the bay. On the western edge of Manele Bay, near Puu Pehe rock is a popular scuba diving destination called First Cathedrals. Manele Bay has a small boat harbor, so boat traffic is often seen in that bay.
Manele Bay is part of the Manele-Holopoe Marine Life Conservation District. The marine reserve cover 309 acres spread between Manele Bay and Holopoe Bay. Keep in mind that it is known to be dangerous to snorkel between the two bays.
To reach the snorkeling on Lanai by air, you can use one of the inter-island flights on regional carriers, such as those from Honolulu (HNL), into Lanai Airport (LNY). Honolulu is served by major airlines from the US, Japan, New Zealand and Australia. Alternately, you can fly into Kahului Airport (OGG) on the nearby island of Maui, and then use the Maui-Lanai Ferry service departing from Lahaina public dock. To reach the Manele Bay snorkeling from Lanai City by car, head south on SR441 for 8 miles. There is parking available at Manele Small Boat Harbor. THen walk northeast along the shore to the small secluded beach. The best snorkeling is along the rocks of the northern end of the bay.
If you are staying on Maui and want to explore the Lanai snorkeling dive sites, one option is to use the Hawaii Ocean Project snorkeling tour boat from Lahaina Harbor, which is a half day tour to two dive sites.
Note: Since early 2015, all of the resorts on Lanai are closed for renovation through early 2016. The only hotel open is Hotel Lanai. It is recommended to consider only doing day trips via the ferry from Maui to Lanai until the resorts reopen.
Overall, Manele Bay is the 2nd most popular snorkel dive spot of all 2 snorkeling dives in Lanai.