You don't need a tree to hang a hammock
I'm always looking for excuses to sleep outside in my hammock. But when all the trees are on the side of the fence you don't want to be on(mountain lion country) you have to come up with something else. So here's a simple way to think outside the box and not get eaten.
Something else you might want to consider is a big knife and a friend that doesn't snore like a mountain lion.