If you have an ADR, the guard gate will have your name. You are allowed to park for 3 hours at no cost for your meal and to enjoy the public areas of the resort.
If you want to go to a theme park, you need to move your car to a theme park lot, return to your own resort hotel, or valet park (at the appropriate fee).
Security does patrol the lots and can tow your car if you are there longer than the allowable time.
Have a nice vacation!