We went here for a Sunday afternoon stroll and got way more than we expected. We started by the library and walked on a bridge/dock over the lake. The lake is stocked with fish and with a urban fishing license you can fish there. On the lake are a huge variety of water fowl, including some really cool ones that dive. All my kids (ages 6, 3, and 1.5 yrs) loved looking in the water. There are also a couple types of turtles in there. You can feed the ducks grains, but not bread. All along the dock are plaques describing the different types of animals in the lake.
After getting of the dock you come to this area with this cool walls, that are decorated with pictures of local animals, that the kids loved climbing on. My one-year-old loved pointing out the pictures of the ants on top and following the ants around. There are also some holes in them the kids enjoyed climbing through.
There is a beautiful cactus garden (it has a real name but I forget it) that was great for pictures, and right next to it was a dino dig. There were dino prints for the kids to walk on and prints of local animals feet.
Walking on we came to a gate which is where the actual trails begin. It was kind of a long walk for our kids in the warm weather (we went in March so it wasn't too hot, but it was afternoon) but they enjoyed looking at the different plants and animals. We saw a rabbit and watched it for a while. There are lots of benches to stop at and there were people with strollers, riding bikes, and walking dogs. The path is surrounded my many ponds and dry basins, which I would assume sometimes have water in them. The ponds had the same types of animals as the lakes. We just took the main trail but there are many off shoots that would be fun to explore.
They have an observatory open Friday and Saturday evenings and education programs, but we haven't done those yet.