While still in High School, we all planned this amazing 2 day trip in California in which we would hit up Six Flags and look around and such... Without telling out parents of course. I believe most of us were about 17 at the time, so none of us had our own car and no way in hell would our parents let us barrow the car 'to sleep over at such-n-such's-house.' Also, we walked around and you'd be surprised how little motel owners care about your age and if you can rent a room or not.
"This night? Never happened." Motto we live by.
PS: Sorry for the length and size