Off site activities. We booked two tours through crparadise.com
Felix picked us up at the hotel for both and then met us at the end of the tour to return us.
A 2.5 hour Tamarindo estuary tour, where we saw crocodiles, mangroves, too many different kinds of birds to mention and howler monkeys.
A 5 hour sailing trip (1 to 6 pm) on the Anteres. Really good food, best I've ever had on a trip like that. A very relaxed and eclectic crew from all over the world.
In addition to those two, like the poster above, we also did a couples spa day at Los Altos de Eres. 500 dollars per couple includes pickup/drop off at hotel (its about 20 minutes up to the spa), choice of 3 treatments per person and a spa lunch. I'm not a big spa person, but the view alone was almost worth it. Glancing at the prices at the JW and what we saw of the facilities there, if you are going to Spa, go for LADE.