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This is circular in shape, over 300 m (984 ft) across and 124 m (407 ft) deep, with many fish, sharks, and corals. The Blue Hole is possibly the most famous dive site in Belize, even though it's nearly straight down. It's at least an hour boat ride away from Caye Caulker. The dive depth is normally described as 40 m (130 ft), but you may go a bit deeper than that. The dive shops typically combine the blue hole dive with two shallower dives afterward, so you'll only be able to stay down at that depth for 5-10 minutes. Once you're down there, you'll take a look at the formations and probably see a few reef sharks. There's not much to it other than that, so many divers regard the trip as being overrated. It's just one of those things you'll want to check off your list as a diver. That said, most divers enjoy the two subsequent dives on the trip. Some of the less scrupulous dive shops will allow you to go on this dive if you don't have your advanced open water certification from PADI. This can be dangerous and you should consider the risks involved.
An eco-friendly full-day tour on a modern 44ft sailing catamaran with snorkelling guides (typically 1 per 6 guests). The tour includes Hol Chan Marine Reserve, good lunch on board, Shark-Ray Alley, Coral Gardens and rum punch on the way home. It's about BZD20.
Eco-tours. They explicitly don't feed the sharks, they use reusable boxes for lunch and let you refill your bottle with water.
This is a great way to explore the northern mangrove forest. Head for the leeward side of the island (the west side) for smoother water and to avoid paddling into the wind. Cost for a two-person kayak is BZ$15 per hour for the first hour, then BZ$10 for each additional hour.