The second largest peninsula in the country (after the Nicoya), the Osa peninsula is mainly taken up by the Corcovado National Park. Green and dense, this park has the largest rainforest on the Pacific coast. Here, you'll find an amazing range of rare species, such as tapirs, jaguars (and that's why you shouldn't go out alone) as well as spider monkeys.
Diving fans will love the coasts around Cano Island, an ecological reserve that has amazing marine life where you can see porpoises, shoals of rays and reef sharks.
And if you're looking for great surfing spots and sandy beaches, then head towards the Pacific side of the peninsula (the beaches at Sirenas and Corcovado). Tried and tested during my trip to Costa Rica.
I strongly advise you to travel to the Osa Peninsula by boat, for two reasons: it's the fastest way of getting there and you'll have the chance to sail through dense mangroves on the way – an unforgettable experience! For travellers looking of a tropical paradise, the Osa Peninsula really has it all: a still well-preserved rain forest, heavenly beaches, and the look and feel of a desert island (outside the main tourist season).
There are various activities available on and around the peninsula, such as diving at Caño Island, fishing, wildlife watching, etc. The jungle of Bahia Drake and the unmissable Corcovado National Park are a hiker's dream.
Take the time to fully see and appreciate this place. You'll feel as if you're one with nature and you'll really enjoy the the peace and tranquility the Osa Peninsula has to offer.