Hiya, Peggy! Welcome to
planDisney!
We always make sure to have the
Park Hopper Option when we buy our
theme park tickets for
Walt Disney World. It's so nice to have the option to begin the day at
Magic Kingdom Park, then hop over to EPCOT for dinner, or spend the day cruising the
Galaxy at
Disney's Hollywood Studios before hopping over to see
Disney's Enchantment at Magic Kingdom.
The way this works, Peggy, is that you will make a
theme park reservation at the park where you plan to begin your day. You do have to go to that park before you can hop to any other park. After 2 PM, you can move on to any of the other theme parks. No reservation is necessary for those other parks.
And absolutely, you can leave the theme park and return later to the same park. You don't even need a park hopper ticket for that, since you technically won't be hopping anywhere else.
I hope this makes planning your days a little bit easier, Peggy. Definitely make sure you make the theme park reservations as soon as you can!
Anna