Yeah. A few years ago I went there with my dad on a summer vacation. Some suggestions:
1 - Do not go on an organized all-inclusive 1 week tour. There is not 1 week worth of stuff to do there.
2 - Spend a day or two in Monteverde. It is a rugged drive, so you may want to hire a driver while in San Jose, but the views are more then worth it.
3 - When in Monteverde, do Sky Trek. It is the best platform ride in the Rainforest, including one over a several hundred meter rainforest canyon.
4 - See Mount Arreal (sp?)
5 - If you go white water rafting, remember that the conditions are seasonal. A three star rapid in the summer is easily five star (as I found out when everyone including our guide fell out of the boat multiple times)