Manta Divers
- Daily Catalina Island dive tours and full range of PADI courses, including introductory dives and accommodation packages. Based at Brasilito.
- http://www.mantarica.com/

Three Monkies Trail
- Customized private tours and eco-adventure trips. Includes descriptions of destinations, volcanoes, hot springs, canopy and national parks.
- http://www.threemonkiestrail.com/

J and C Tours
- Specializes in private and small group tours and transportation. Includes information on the beaches and hotels in this area. Based at Playas del Coco.
- http://www.jandctours.com/

Iguana Expeditions
- Adventure guides specializing in Costa Rica and Nicaragua. Jungle river, birdwatching, sea kayaking, waterfall treks and surfing. Based in Nosara. [English/German/Spanish/French]
- http://www.iguanaexpeditions.com/

Agua Rica Diving Center
- Scuba and snorkeling equipment rental, certification courses and boat dives along the Guanacaste coast. Based in Tamarindo.
- http://www.aguarica.net/

Costa Rica Diving
- Specialty instructors with a focus on marine biology, boat trips and equipment, based at Flamingo with diving throughout Guanacaste. Photos and description of dive spots, guestrooms.
- http://www.costarica-diving.com/

Resort Divers
- Scuba expeditions with dive sites throughout the Guanacaste coast, equipment, PADI courses, choice of hotels. Also offers sailing and fishing tours, jet ski and ATV rentals.
- http://www.resortdivers-cr.com/

Rich Coast Diving
- PADI certified courses based at Playas del Coco. Includes detailed rates for dive trips, equipment rental, sailboat excursions. Also offers full vacation packages with choice of lodging and land excursions.
- http://www.richcoastdiving.com/

Bill Beard's Costa Rica
- Diving and adventure tours, based in Playa Hermosa. Describes destinations, with trip schedule and general information about the country.
- http://www.billbeardcostarica.com/