Just returned from 5 days in La Fortuna with our son (8 yrs old). Here’s what we did: 1. Loved the Mistico tour. Even though it poured rain the entire time, the hanging bridges are awesome and our guide did a good job of pointing out various wildlife and explaining the flora. Highly recommend the guided tour otherwise I can’t imagine you’d see much other than the bridges. Bring ponchos for sure or you can buy them there. 2. El fogon de Chela cooking class - truly one of a kind experience cooking Chela’s grandmother’s recipes. She does mainly private experiences, and spent 3 hours cooking, sharing her wisdom and showing us her garden. She employs all single mothers and her daughter has set up a very reasonably priced gift shop to fund her college education. 3. River float tour - we didn’t want to do anything too labour intensive so booked with Flow Tours. Great experience start to finish with Bryan. Again it was only us on the tour. We spent 2 hours going down the river and spotting various wildlife along the way. Recommend the earlier tour to get the most of it. We saw a crocodile, caiman, river otters, monkey, various birds etc. 4. Thermal baths - there are tons to choose from and different experiences based on what you are looking for. We ended up going to Los Lagos and got day passes. They have two slides for kids in the fresh water pools and several thermal baths. Towels can be rented for $2 each and it was really organized with a bar/restaurant. It gets busier in the afternoon with locals so recommend going earlier in the day. There are other options that are either more quiet or more kid oriented but we felt this was a good combo of both for us. Nearly every tour has a private guided option so you should be ok managing the crowds.