Hey there, Stacy! Thanks for stopping by planDisney with your question.
I think that you'll be happy to know that you are absolutely able to leave and re-enter
Magic Kingdom Park (or any of the other Walt Disney World Theme Parks) the same day. Currently, to visit any of the Walt Disney World Theme Parks, Guests need valid theme park admission and a park pass reservation.
Park pass reservations are basically like a virtual place in line at the theme park you'd like to visit each day. This system was put in place when Walt Disney World reopened last year to help with lowering theme park capacity. A park pass reservation guarantees you entry to that specific theme park all day long.
If you haven't purchased your Walt Disney World Theme Park tickets and made park pass reservations yet, I encourage you to check out the
Walt Disney World availability calendar before doing so to make sure Magic Kingdom Park has availability for the dates you'd like to visit. If there is, then go ahead and purchase your tickets and link them to your MyDisneyExperience account. Once that's done, you can visit the park pass reservation website. There, you'll select your party, pick and date on the calendar and then the theme park you'd like to visit. If all goes well, you'll be taken to a confirmation page and the selection should automatically show up in your MyDisneyExperience account.
Magic Kingdom Park is so much fun, you are going to have a wonderful time visiting. If you are looking for a fun and unique snack while you are there, I've got a suggestion for you! One of my favorite snacks is the spring rolls from a cart near the entrance of Adventureland. Currently, the choices are cheeseburger or buffalo chicken. I really like both and if you'd like you can even mix and match the order since you get two rolls per order. The cheeseburger is the classic standard flavor and then the other one rotates so I'm not sure what the other flavor will be when you get there but they are always delicious.
I hope this helps, Stacy. If you have any other questions before your day at Magic Kingdom Park, please feel free to stop back by and
ask me. I'm happy to help. Have fun!