Escondido Trex (t 2735-5210, w http://www.escondidotrex.com), with an office in the Restaurante Carolina, offers a wide range of tours, including hikes into Corcovado. For a more unique excursion, biologist Andy Pruter of Everyday Adventures (t 8353-8619, w http://www.psychotours.com) takes people on high adrenaline “psycho” tours that include climbing 45-metre fig trees, rappelling waterfalls and ocean kayaking ($55–75). They also lead short hikes into the rainforest ($45).
If you’re planning a trip to Corcovado, the Oficina de Area de Conservación Osa (Mon–Fri 8am–noon & 1–4pm; t 2735-5036), facing the airstrip, is staffed by friendly rangers who can answer questions and arrange accommodation and meals at Sirena (though you’re advised to sort this out well before you arrive – for details see Local guides).
A good place to relax after a strenuous hike out of Corcovado is Playa Platanares, a pleasant beach with plenty of empty sand about 5km east of Puerto Jiménez.