you can come back easily if you drive.
try your best to show them you are really landing and prepare to stay there. you'd better show them how much money you bring. i told them i have some cash with me, they did not check it and remind me take the bay with me, do not leave it in the car. and also try your best to bring more living stuff. we drove our car, and just leave two seat for us.
should you have more questions, just ask.
thanks.