I've done everything from mountain biking, to short hikes, to all day hikes in South Mountain. And first let me say that I feel that I've yet to really get into even a fraction of what South Mountain has to offer.\n\nFirst off, the BEST place to get information on South Mountain is at HikeArizona.com. For SM specifically, go here http://hikearizona.com/traildex.php?ID=34&sRID=52&SHOW=YES\n\nI've done all or parts of the Mormon Loop, Guadalupe Ridgeline, Desert Classic, Pima East Loop, Pima West Loop, Javalina, Dirt Road, National, Geronimo, and Telegraph Pass. In other words, I've been on many of the eastern trails but haven't even touched the western trails. I need to get on that!\n\nWith that said, these ARE shared trails. You very well may encounter mountain bikers on these trails. Some of them are VERY inconsider it and go racing down and run over everything. If I remember correctly, a lot of people consider SM as a mecca of mountain biking and some even train for competitive mountain biking here. And from my experience, it is pretty good for mountain biking... even though I suck at it.\n\nWith that said, I am more of a hiker. I enjoy getting away from the hustle and bustle of the city and mountain bikers nearly riding by and clipping your ankle can be a bit bleh of this mountain. I want peace and quiet, yo! So I am going to say this... if you're looking for solitude, you may not find it here - especially when the weather is nice and on the weekends. If you want solitude, you'd be better off in the White Tank Mountains, especially if you can muster a 14mile trip... or the Superstitions. Neither of those places have I ever encountered mountain bikers (The White Tanks actually has a designated area for bikes). Likewise, Piestawa and Camelback mountains are always packed with people.\n\nSo, know your goal. If it just for exercise, the South Mountain is one of my favorite, partially because it is close to my house. If I want no people then it is Superstitions or White Tanks.\n\nThis should go without saying, but bring water. Let me correct myself, bring more water than you think you'll ever need. Arizona is notorious for dehydrating people. I personally bring a Camelbak 3L (100oz) filled completely up with water. I also bring a few flashlights/headlamps just in case I find the sun setting on me when I'm still out there.\n\nWhich reminds me... I've done numerous night hikes with the moon on SM. I actually didn't need a night except a few times where I wanted to make sure of my footing. So, if you aren't afraid of the dark... I highly suggest going hiking at night! It also gives a WONDERFUL view of the big sprawling city we call home - Phoenix. It's view off the National and Geronimo is supa-dupa awesome.\n\nWith that said, I give this trail a 5 star only because I think it offers so much and has a lot of diversity. It's not a trail system that you get into and go \"oh ****\" a mile in and have to turn back. There are so many options to match your skill level and desired activity that it almost seems ridiculous. It may take a few times going to get a trail route figured out that you like (right amount of people, no bikes, good views, etc.) but once you do then it is golden.\n\nOn an impersonal note, parking can be busy during peak times. And, the gates close at sunset. You can still drive out after dark though. Park is dog friendly but please pack out what you pack in (I'm talking about dog poop here).\n\nEnjoy and see you out on the trail!