Six kilometers north of Cañas, the Pan-American Highway crosses the Río Corobicí. The 40- kilometer-long river is fed by controlled runoff from Lake Arenal, providing water year-round, good for rafting.

The trip is a relatively calm Class II run described as a “nature float.” The river is lined with a riparian forest of mahogany, ceiba, and palms. Motmots, herons, crested caracaras, egrets, and toucans are common, as are howler monkeys, caimans, and iguanas basking on the riverbanks. With luck, you might even spot a crocodile.

Safaris Corobicí (tel./fax 506/669-6091, www.nicoya.com) has an office beside Highway 1, about 400 meters south of the river. It has guided floats on the river ($35–60), as does Ríos Corobicí, at Restaurante Rincón Corobicí (tel. 506/669-6262, rincon [at] racsa [dot] co [dot] cr).