A nice park. It has lots of playground equipment and things for kids to play on, as well as the mountains you see in the background. You can mountain bike here, (the trails are mostly beginner, but there is a 'secret' jump park nestled next to the reservoir) disc golf, hike, look at stuff in the distance, watch the planes land at Sky Harbor.
The only drawback is that near sundown lots of homeless people usually hang in the park. Not really a big deal for me but y'know, little kids and stuff.