It is a Free Zone, so border crossing is easy, and inexpensive. You do not require a vehicle permit, however you will be required to provide the U.S. Dept. of Homeland Security or Customs a “Valid Passport” on your return Stateside. Have a valid Drivers License, if driving, and make certain that you do NOT wander outside of the Free Zone. Failure to observe street signs and ending up out side of the Free Zone could cost you mucho dinero or pesos if you will. It’s against Mexico’s Federal Law to operate a foreign plated vehicle without a vehicle permit outside of the Free Zone. The Hotels are awesome, food and drink plentiful. If you are going dancing or clubbing, crowds are packed into most venues.