My girlfriend and I passed the signs for Neo Fauna for 3 days while in Jaco. On our last day we were shopping in the area and decided to check it out.
We arrived the same time another group did and decided to do the $20 tour with them. We were presently surprised. We got to see about 6-7 snakes some of which were poisonous. Even got to hold 1. Then we did the same with frogs. Got to hold a red eye tree frog. The butterfly area was swarming with them. It was really cool see in it all up close. My favorite part was the poison dart frogs.
At the end the guide let me and my girlfriend hold Cesar the monkey they rescued that's in the reception shop. Check it out. $20 for about 2 hours was worth it. This was our last day of our 11 day trip to costa rica and we had only seen 1 of the frogs in Manuel Antonio that they had. Its worth it! Check out our pictures.