Wherever you are, prepare an explanation that fits the circumstances, in case your presence is challenged. At a small-town airport, you could say you received an emergency message from home, and you might have to charter a light plane in the morning. At a road-side rest area, tell the police your car blew a fuse and you thought it best to not drive until morning. In any case, plan ahead and groom yourself so you do not look like a dispreputable character, and see to it that a search of your car will not yield any drugs, guns, alcohol, porn, etc. Never block access by any vehicles that might legitimately need to get by. Leave the key in the ignition and the drivers seat free, in case you have to leave in a hurry.