Good place to hike away from the city and people. There are a few trails out here (elephant mountain, sugarloaf mountain, Black Mesa, etc.) that have some awesome payoffs if you make it to the top. I have been here twice and once was in September (not sure what I was thinking hiking 10 miles in 102 degree weather) and once was during a rain in March; both experiences were good. There is quite the variety of flora (saguaro, cholla, Mormon tea, creosote, chaparral, hackberry, ironwood, barrel cactus, palo verde, and the like) and fauna (side-blotched lizard, mule deer, coyote, and other desert wildlife). It's $3 per person for entry into spur cross and there is not much trail until you enter Tonto National Forest. If you do your research there are a lot of Hohokam ruin sites in these hills; but please remember leave it as you found it and don't take anything from these sites. They are spiritual grounds to many people and we want to ensure everyone can enjoy them. If you do decide to venture into Tonto the maps are not very informative and you need to educate yourself on where to go before venturing out into the desert. Ensure you take water and proper supplies as it's pretty secluded and cell service is non-existent.