Boating and Kayaking

Various outfitters offer trips to Puerto Mosquito, the island's celebrated bioluminescent bay. Most trips are made in single-person kayaks, which can be a challenge if you lack experience or endurance. A better option for many people is an electric-powered boat—gas-powered engines harm the environment.

Abe's Snorkeling and Bio-Bay Tours. Abe is one of Vieques's most animated characters, so it's no surprise that his kayaking tours to Puerto Mosquito are the most popular. Over the course of two hours, guests kayak into the glowing bay for a once-in-a-lifetime experience. For an entire day on the water, Abe's All-in-One Tour involves kayaking through mangrove lagoons, snorkeling coral reefs, watching the sunset on a secluded beach, and visiting the bio-bay after dark. Lunch is provided. Esperanza, Vieques. 787/435–1362; www.abessnorkeling.com. Night tours from $60, five-hour tours from $150.

Black Beard Sports. This five-star PADI dive center in downtown Isabel Segunda is a one-stop shop. In addition to renting snorkeling and diving gear, the team arranges dive trips; PADI certification courses; and kayaking, biking, snorkeling, and hiking ecotours. Their 2½-hour, bio-bay excursions ($55 per person) feature clear-bottom kayaks and include pick up and drop off. 53 Calle Benítez Guzmán, Isabel Segunda, Vieques, 00765. 787/207–4222; www.blackbeardsports.com.