I plan to take the family car, drive out of the city, and do it in some suburb parking lot. I wanted to try a motel or hotel but sadly I'm not 21 yet. If options are low honestly a portapotty would work as if its locked, it will likely be at least a day before anyone comes to unlock it and more or less guarantees privacy. It also just comes with the downside of being one of the least comfortable environments to go. I've also heard the cruises are one the best places for it, as you have an ideal experience leading up to it and the company willusually take care of cleaning up everything and delivering your body by policy.