Is there anywhere you could get to that is a -very- secluded area but still not unreasonably far out of town?
I'd say do something outdoors in like some field somewhere, try to procure a generator or something, and throw a crazy party! Have people bring tents to camp in, trailers or whatever, get creative! If you know someone with a farm or something, a barn, silo, hangar, all these locations make for great raves!
I basically just attended something like that this weekend. Some guy owns several acres of land out in the middle of nowhere, and every year he throws a huge event where 100s of hippies come from all corners, pitch tents everywhere, and PARTY ALL NIGHT in the outdoors, DJ spinning until about 4:30am, everyone trippin', rollin', smokin', not a single authority figure in sight. Epic time as long as everyone has a common respect. It wasn't a 'rave' as much as it was a small scale festival which is probably what you're going for.
Don't be dumb and have it at someone's residence though even if they have a ton of land. Rave+drugs+loud music+someone's name/home to tie to all to=bad. At least if it's in some secluded place where it's JUST land, and the landowner doesn't actually live directly nearby, and for some reason authorities do show up and break it up, the owner could always be like "It was the middle of the night, I was in bed at my home, I had no idea a bunch of kids threw a party on my land, what was I supposed to do?"
That excuse might get you out of some simple noise ordinance issues and such, however if some dumbass OD's or some serious shit goes down, I dunno how far that excuse will get you.