Airplane to Drake Bay
From San Jose or Quepos, board one of the daily flights by SANSA, Nature Air, or a private charter to the Drake Bay airstrip.
At the airport, you will take a short taxi drive to Drake Bay. Here a boat will take you on a 10 minute ride to the Corcovado and Caletas areas.

Optionally, for the adventurous types, you could skip the taxi and boat ride.
You could hike the 6 miles distance to Drake Bay beach, and from there go across the Drake river using a walking hanging bridge, then climb some hills that run near the shore and get down to Las Caletas beach where the camp is. This is like another 8 miles hike.
This whole walking adventure could  take you around 1 1/2 to 2 hours, so be prepared with drinking water, head gear, and proper backpacked luggage.

Airplane to Palmar Sur
From San Jose or Quepos, board one of the daily flights by SANSA, Nature Air, or a private charter to the Palmar Sur airstrip. A 30-minute taxi ride through co-opted palm oil and banana plantations leaves you at the banks of the Sierpe River where our transport boat will meet you for the ride down this jungle river. Lined with biologically-thriving mangrove forests, the Sierpe provides a chance to view some of the local inhabitants in their native setting -- turtles, crocodiles, roseate spoonbills, to name just a few. You'll enter the Pacific from the mouth of the Sierpe, then cross Drake Bay before making landfall on Caletas de Osa's golden-sand beach.

Adventure Route:
This is for people that are willing to hike, have their belongings in secure backpacks, are willing to see more of Costa Rica, and spend more time getting to the camp.
Take a bus to San Isidro from San Jose. You will go up the "Cerro de la Muerte" and come down in San Isidro del General, after having lunch in this town, take another bus to Sierpe. Once you get to Sierpe, you will have to contract a boat ride to Drake Bay or Las Caletas where the camp is. Allow a full day to make this trip.
If you get on a boat to Drake Bay and still feel full of energy, you could hike to the camp by following instructions detailed above under "for the adventurous types".