Rental-car companies say policies can vary, depending on the particular office. Ask when you reserve. On many cars, you have to press a release button or lever somewhere inside the passenger compartment to open the gas cap. Ask a clerk at the rental-car office to show you the location of this and all other important controls. Find out before you head for a tourist attraction.
Tour buses can overload exhibits, rides, and shops with crowds.
But the buses have fixed schedules, and they typically stay for only a few hours. Pick another time to visit.