We stayed at Mis Ojos for 7 nights, it was quite an experience for me, for my boyfriend the tree-hugger though it was paradise. This treehouse is almost right in front of a waterfall. The view was spectacular. Since waterfall has no off switch, do expect some noise, we love to sleep to sound of waterfall though. We did zipped lining which was cool, and hiked around to check out the forest and other treehouses. If you are looking for tranquility, this is the right place.
Staff was especially helpful, gave us tips to do day trips. We drove to Golfito to do kayaking and mangrove tour in Sierpe (highly recommended). Food was nice too.
Some tips before you travel, do take notes from the video from Finca Bellavista website, and keep bug repellent handy!