Folsom vs. Dore Alley
IMO - I find Dore to be more local and less of the tourist trap that Folsom tends to be. Don't get me wrong, I have a great time at both, but there's a local energy and vibe at Dore Alley that is quintessential SF. Keep in mind - July is one of our coldest months, so getting naked when it's 55, grey and damp is not for the faint of heart. Stay nude and see you out there :)
I just went to the Folsom Fair for the first time. I enjoyed the freedom of walking naked amongst the textiles and no one cared at all. I just hope that the few masturbators don't eventually cause these type of events to become nudity banned events.
Last time I was at Folsom Street Fair, it was overrun by str8 college kids wanting to take photos of guys sucking and jacking off there. I was enjoying a nice cock on a hot dude, and this young male-female couple came up to take pics and comment. I said "can't you people find your own street fair?" So it has been ruined by the wrong types in my opinion. Dore Alley is a lot purer and there aren't as many of those "tourists" there. I felt a lot more comfortable there overall.