Parks: A Natural Treasure - Site providing detailed information on the National Parks and Reserves of Costa Rica. - http://www.costarica.com/Home/Travel/Places_to_Go/National_Parks
Costa Rica National Parks - Information, trail maps, facilities and driving directions for each of the 161 national parks and wildlife refuges. - http://www.costarica-nationalparks.com/
Costa Rica's National Parks and Reserves - Detailed description of 16 National Parks and 10 National Reserves - http://www.worldheadquarters.com/cr/protected_areas/
The National Parks of Costa Rica - Site providing brief details on the National Parks of Costa Rica. - http://www.centralamerica.com/cr/parks/index.htm