Anonymous wrote:3 nights in Arenal (white water rafting, zip lines, volcano) and 3 nights in Manuel Antonio (beaches and monkeys)
Travel planner here. Agree with this. I just booked a similar trip with 4 nights in each for a client for spring break. I would recommend Tabacon or The Springs in Arenal, and the Marriott in Los Suenos. Monteverde Cloud Forest is a must see, along with Tortuga Island, Manuel Antonio National Park.