Bishops Cruises will take you to snorkel in the best of Aitutaki's pristine waters, an incredibly beautiful lagoon. Snorkel with giant clams, turtles, and colorful fish, and then visit One-Foot Island, the only uninhabited island with a post office (bring your passport and get a barefoot stamp). Lunch, which is served at a table in the water, consists of freshly caught fish and tropical fruits.