The Bora Bora Lagoonarium is a natural aquarium on a small motu (island), just east of the main island. (By "natural," we mean that this aquarium isn't man-made. Rather, it's a portion of the actual lagoon). One of the coolest things about this family-owned attraction is that you can actually snorkel on the premises under the supervision of wildlife guides. Beneath the lagoon's surface, you'll spy sharks, turtles, rays and many different kinds of ocean fish. And depending on what tour you choose (full-day, half-day morning or half-day afternoon), you'll enjoy a number of extras, such as a canoe tour of the island or a barbecue picnic. 

Reviews were mixed on the Bora Bora Lagoonarium. Some described the Lagoonarium as a great introduction to snorkeling since it feels safe and confined, especially when compared to deep-sea snorkeling, which might push some out of their comfort zones. Others also enjoyed feeding the fish. However, some travelers were unimpressed with the state of the boat and the setting the animals live in. 

Half-day tours range from 6,200 to 9,500 francs (the equivalent of about $60 to $92) depending on whether you go in the morning or the afternoon. You'll need to book a reservation directly with the Lagoonarium, and they'll schedule a time to pick you up from your hotel.