Yes, you can absolutely come and go from the parking lots at Walt Disney World and Disneyland on the same day with a single parking pass. When you pay for parking at one of the theme parks, your receipt or digital pass is valid for the entire day at all four theme parks (Magic Kingdom, EPCOT, Hollywood Studios, and Animal Kingdom in Florida). This is particularly useful for guests with the "Park Hopper" option or those who wish to take a midday break at their resort. To re-enter, you simply show your original parking receipt to the cast member at the toll plaza. If you have paid for Preferred Parking, you can also park in the preferred lots at the other parks, subject to availability. However, it is important to note that paying for parking once does not "guarantee" a spot if you leave and return later during a high-capacity day; if the lot is full, you may be redirected. For Disney Resort guests and select Annual Passholders, standard parking is complimentary, allowing for even more seamless transitions throughout the day.