Sorry but this thread made me laugh. It's kind of like looking for camping for a festival at RFK.
As someone else suggested, I'm sure for the right price, one of the neighbors will let you camp out on their lawn or maybe even in their backyard. They have trees. It might not be that bad if you are truly the adventerous sort. I'd just make sure the person collecting the money actually owns said property. Same for parking on their lawns as it's happened before where some neighborhood slug has claimed to own the place, pocketed the money and moved on. Also, don't sleep too tight just in case that slug sneaks up on you for a little night prowling like a bear in the woods.