Head north toward the Nicaraguan border to explore the Caño Negro Wildlife Refuge, a Ramsar-designated wetland of global importance.
Board a safari-style boat for a half-day float trip spotting monkeys, sloths, caimans, iguanas, turtles, and hundreds of bird species.
A local lunch completes the day before returning to Arenal.
Dinner at the hotel.
Overnight in Arenal.