Where are you in Costa Rica? My wife and I spent a week there back in '04, so you might remember us
We spent 3 days at the base of the Arenal volcano. But it rained the whole time, and we never got to even see the peak through the clouds. Adding insult, our plane had arrived late; if we'd been in time, we would have seen the nice eruption that afternoon (before the clouds came in).
The rest of the time we spent on a beach on the Pacific Coast (I forget the name of the town).