I've been researching a while about Costa Rica, in anticipation of our trip there Easter Week 2012. (Yes, we know it will be busy.)
We have girls 9 and 12 who like a lot of adventure. Arenal has plenty of activities - zip lining, bridge, cave, rafting and some hiking on the trail. It also has some pretty nice spas/hotels, but we aren't interested in that.
Can someone tell me what Arenal does best? What is the must-see attraction or activity in Arenal that you can't do (or can't do as well) anywhere else in Costa Rica?
I'm tempted to skip it and spend time elsewhere, but it's obviously a popular destination for a reason. But it's hard from the guidebooks (Moon, Lonley Planet) to figure out why it is the main place for tourism.