It took me a year and a half of living in Phoenix before I found this park one day while driving on 59th Avenue and I consider it somewhat of a hidden gem. It is nowhere near as challenging as Camelback Mountain or Piestewa Peak but in many ways I find it better.
There's always somewhere to park and it's free. The trails are well marked and easy to navigate. I think the trails are well kept and clean. Only once in awhile I'll have to dodge dog or horse poo. I never feel like I'm going to get lost while out wandering.
Another thing that was super important to me was that I feel safe hiking here alone in the early morning. Most of the people that hike here are friendly and will give a polite "Hello" or "Good morning" in passing - which I noticed some Yelpers tend to not like, what the heck?
On some portions of the trail you almost feel like you're not in the city anymore - it's that quiet. Definitely one of my favorite places to spend a morning in the Phoenix area.