• Mountain-Biking the Back Roads of Costa Rica: The lack of infrastructure and paved roads here that most folks bemoan is a huge boon for mountain bikers. The country has endless back roads and cattle paths to explore. Tours of differing lengths and all difficulty levels are available. The top specialist in this type of trip is Coast to Coast Adventures.
  • Swinging through the Treetops on a Canopy Tour: This unique adventure has become ubiquitous in Costa Rica. You'll find zip-line canopy tours all over the country. In most cases, after a strenuous climb using ascenders, you strap on a harness and zip from treetop to treetop while dangling from a cable.
  • Rafting the Upper Reventazón River (near Turrialba): The Class V Guayabo section of this popular river is serious white water. Only experienced and gutsy river runners need apply. If you're not quite up to that, try a 2-day Pacuare River trip, which passes through primary and secondary forests and a beautiful steep gorge. Plans to build a dam here have thankfully been rejected, or at least stalled, for the time being. Costa Rica Expeditions can arrange these tours.
  • Surfing & Four-Wheeling Guanacaste Province: This northwestern province has dozens of respectable beach and reef breaks, from Witch's Rock at Playa Naranjo near the Nicaraguan border to Playa Nosara more than 100km (62 miles) away. In addition to these two prime spots, try a turn at Playa Grande, Punta Langosta, and playas Negra, Avellanas, and Junquillal. Or find your own secret spot. Rent a four-by-four with a roof rack, pile on the boards, and explore.
  • Trying the Adventure Sport of Canyoning: While far from standardized, canyoning usually involves hiking along and through the rivers and creeks of steep mountain canyons, with periodic breaks to rappel down the face of a waterfall, jump off a rock into a jungle pool, or float down a small rapid. Pure Trek Canyoning, Desafío Adventure Company in La Fortuna, and Psycho Tours, near Puerto Jiménez, are the prime operators.
  • Windsurfing or Kitesurfing on Lake Arenal: With steady gale-force winds (at certain times of the year) and stunning scenery, the northern end of Lake Arenal has become a major international windsurfing and kitesurfing hot spot.
  • Diving off the Shores of Isla del Coco (off the Pacific coast): Legendary among treasure seekers, pirate buffs, and scuba divers, this small island is consistently rated one of the 10 best dive sites in the world. A protected national park, Isla del Coco is surrounded by clear Pacific waters, and its reefs are teeming with life (divers regularly encounter large schools of hammerhead sharks, curious manta rays, and docile whale sharks). Because the island is so remote and has no overnight facilities for visitors, the most popular way to visit is on 10-day excursions on a live-aboard boat, where guests live, eat, and sleep onboard — with nights anchored in the harbor.
  • Hiking Mount Chirripó (near San Isidro de El General on the central Pacific coast): The highest mountain in Costa Rica, Mount Chirripó is one of the few places in the world where (on a clear day) you can see both the Caribbean Sea and the Pacific Ocean at the same time. Hiking to Chirripó's 3,724m (12,215-ft.) summit takes you through a number of distinct bioregions, ranging from lowland pastures and a cloud forest to a high-altitude páramo, a tundralike landscape with stunted trees and morning frosts.

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.