Hi Ken! Welcome to planDisney!
I am thrilled to hear that you have a day planned at Magic Kingdom Park soon! I can almost hear the music playing down Main Street, U.S.A., and taste the Fresh Fruit Waffle Sandwich from
Sleepy Hollow as I think about it. You have a full day of fun ahead of you!
With the return of park hopping, there is a chance that
Magic Kingdom Park could reach capacity limits later in the day and close to new Guests. But in my experience, I have not had any trouble returning to any of the theme parks and I have had multiple trips to the Walt Disney World Resort since it reopened last summer, including since the
return of park hopping earlier this year.
Personally, I would feel comfortable leaving the theme park for a midday break and returning later that day, but it is totally up to your comfort level if you are willing to. If you are concerned that the park will reach capacity, consider returning before park hopping hours begin (currently at 2:00 PM).
I hope this helps, Ken! Please let us know if you have any other questions.
Tabitha