We stopped in at Picacho Peak on our way from Tucson to Scottsdale, having already hiked that morning at Sabino Canyon in Tucson, so we were looking for a fairly moderate hike. We knew the Hunters Trail was more than we could handle, so we opted for Sunset Vista, a "moderate" trail that begins at the northernmost parking area.
The trail was surprisingly difficult, with a lot elevation increase in the initial half mile that involved climbing up some large (2 foot) stone and wooden steps. The trail then travels along the west side of the mountain at a fairly constant elevation, but getting across multiple arroyos involved more up and down on fairly steep grades. The trail mostly consisted of loose rocks so it was pretty treacherous at times, at least for a trail advertised as "moderate." We only had about 2.5 hours to spend, so we did not travel all the way to the summit.
Most of the park seems to be composed of relatively desolate "moonscape" which is dramatic but also a bit creepy after a while. Vegetation is quite limited and sparse. However, there were definitely great views of distant mountains across the valley and the hike was a good experience for us.
The park entry fee of $7 was reasonable and the staff at the visitor center were extremely friendly and helpful.