Snorkel with a buddy. Here are some of the favorite spots. This lava formation near the Sheraton Maui is a favorite spot for beginners since it is a gathering spot for colorful fish. The reef offshore one of the best swimming beaches is a great place for beginners. Honolua Bay This is a marine sanctuary so don't take anything including sand.
Winter is a little rough here.
Other seasons it's probably the best snorkeling on Maui. For the advanced snorkeler, this is a challenge. On the way to and from Lahaina, you zip through the little town of Olowalu and Chez Paul restaurant. Watch for the sign to Olowalu Beach. Park along the roadside.