I went the past 9 years...not this year tho.
They say no camping by the car but that's BS....if they give you a hassle, just do what they say til they leave and then move.
Bring your own shade/sunblock. There's almost none and it's always hot as hell there.Try to park close to the gate as it can be a brutally long walk if you get parked far away, up and down hills. ADA and RV camping are closest. The port-o-lets are generally very clean, they have a hose truck for water and even sell 5 buck showers.
You can bring non-glass into the show. Big bonus as they do sell beer but it's not cheap (they usually get an unusal but good brewery). Expect a major search on the way in. I lost a glass last year as well as a jar and that's one reason I'm not going this year. Long story.
Also, be aware, there's a lot of great folks there and I've made some really good friends I'd see every year in the same places but, there's a LOT of very sketchy junkies and a lot of white evil powders floating around. There's always some very negative occurances each year. It doesn't get called AllHood for nothing. Just be careful what you do and with whom and you'll have a blast. Oh, and the sound is great. They always have a killer system, they're always pon time and the event itself is run like a swiss watch. This year's line up looks as good as ever.