From Costa Rica Travel Guide: Vacation and Travel tips
If you're not sure what canyoning aka canyoneering is, I think this video will give you a good idea. We love canyoning in Costa Rica because it combines all the elements we love about ADVENTURE- Rappelling, hiking, trekking and quazi ziplining in a beautiful rain forest environment, which makes it a great all around tour. This is definitely a tour you want to try and make time for and if you're worried about safety, don't be, it's VERY safe and professionally executed adventure tour. Have FUN, I know we did.