Our library has culture passes, which are free tickets to certain educational places in the area, such as museums. We checked one out for the Desert Botanical Garden and visited it yesterday. It wasn't as beautiful as I had expected, but it did have the coolest looking cacti I have ever seen! It also wasn't little-kid friendly. Only one trail had hands-on things Caden could do, and even then, his interest didn't last long.
The best part was the butterfly (or "bufferfy" as Caden says it) exhibit, which we had to pay for because it wasn't included in the culture pass. It was well worth it! I saw the most beautiful variety of butterflies. They were so active though, so it was hard to get good photos of them, especially the most exotic looking. Caden liked it at first, but soon grew afraid of them flying all around him.
Overall it was a pleasant experience, but I'm glad it was mostly free!