Osa Aventura
- Wildlife adventure tours and rainforest study programs with biologist Mike Boston. Gives detailed descriptions and advice, as well as published articles.
- http://www.osaaventura.com/

Everyday Adventures
- An adventure travel company located on the Osa Peninsula in Costa Rica. We lead rainforest treks, ocean kayaking, tree climbing, sportfishing, horseback riding, and wildlife photography tours.
- http://www.everydaycostarica.com/

Corcovado Adventure´s Tent Camp
- General information about Corcovado, including activities like snorkeling, scuba diving, hiking, fishing, kayaking, horseback riding and bird watching.
- http://www.corcovado.com