Diving -- Spotted tiger rays, blacktip sharks, stingrays, spider crabs, parrot fish, angel fish, barracuda, and triggerfish; they are all out there in the pristine waters, waiting for you to drop in and say hello. Nautilus Dive, north of Brig Bay (tel. 505/2575-5077; www.nautilus-dive-nicaragua.com), is the most-established dive operator on the island. It offers everything from open-water to advanced courses and allows guests to explore the island's three coral reefs or a volcanic pinnacle known as Blowing Rock. Fun dives start at C800, and a 3-day open-water course costs C6,000. Nautilus Dive also offers snorkeling tours and glass-bottom-boat excursions over reefs and shipwrecks for those who don't want to get their feet wet.

Fishing -- The islands provide excellent sport-fishing opportunities for red snapper, king fish, and barracuda. Blue Runner Charter (Southend; tel. 505/2847-5745) is run by true-blue local fisherman Alwin Taylor and offers sea tours and fishing trips, which cost between C3,000 and C5,000. Another outfit that offers fishing opportunities around the islands is Corn Island Flyfishing (tel. 505/8650-6381; cornislandflyfishing@gmail.com).

Snorkeling -- You can pull your goggles on anywhere around the area and go for a fish-filled float. However, one of the best places to snorkel is in the shallow waters around Sandy Fly point. You can rent snorkeling equipment at most hotels for C280 per day.

Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.