So we got stuck being in Vegas on a holiday weekend without a reservation. Who knew there was a campground ON THE STRIP! Now, the place is a dump and it still cost us $50/night to sleep on the grass, but it was pretty cool.
But this is a last resort option. Don't even do it just for fun. Do you know how hard it is to sleep outside, on the Vegas strip, in a desert, with dust storms and 24 hour neon?