This is a very nice water/nature reserve right near my parent's place and I had no idea it was there all these years, I found it on TripAdvisor as it is the #1 rated thing to do in Gilbert (the other top things being Mormon-based). There is a nice network of trails that goes between some ponds, some of the ponds are totally dry, but there are rabbits, small birds, and fowl to watch. You feel more like you are in the desert while being in the middle of the burbs, a nice escape that you can walk in a couple hours.