There are many beautiful places to visit in Costa Rica, one of them being the cloud forest of Monteverde.
You see I didn't really know what a cloud forest was, but as you can imagine, it's characterized by the persistence of a cloud cover around the canopy level. It tends to be moist, but then, it's also remarkably green. Monteverde is in Puntarenas and is about 4 hour drive from San Jose. The proximity makes it a popular tourist destination, so there are plenty of activities including zipline.
I was impressed. I don't know if I'd seen a zipline that high before, where people are flying above the trees.
If you don't manage to zipline (as I said, it can get really really windy there) or don't have time (it takes 2.5-3 hours), you can always walk around the treetops using the hanging bridges. Do you see the green bridges in the midst of trees there?
It's a pretty short hike, with 1.5 miles of trails and 6 bridges.