Big Blue Unlimited. Big Blue Unlimited's educational ecotours include three-hour kayak trips and other guided journeys throughout the cays that lie to the northeast of the island, as well as on North, Middle, and South Caicos. Its Coastal Ecology and Wildlife tour is a kayak adventure through red mangroves to bird habitats, rock iguana hideaways, and natural fish nurseries. The North Caicos Mountain Bike Eco Tour gets you on a bike to explore the island, which includes the plantation ruins, inland lakes, and flamingo pond with a stop for lunch featuring local cuisine along the way. Package costs range from $85 to $225 per person. With 18 years of experience, their service is exceptional. Leeward Marina, Marina Rd., Leeward, Providenciales, TKCA 1ZZ. 649/946–5034; 649/231–6455; www.bigblueunlimited.com.