Hello Meredith,
Thanks for stopping by planDisney with your question!
While I do know a few people who can get to Magic Kingdom at rope drop (park opening), spend the entire day, and still be going strong after the fireworks, most people benefit from some downtime in the middle of the day to refresh, recharge, and refuel.
You only need to make one park reservation per day. Heading back to your resort mid-day to eat, swim, or even grab a power nap can really help revive you and everyone in your party. When you are ready, you can head back to the park for more fun!
Don't want to head all the way back to your resort, but want a change of atmosphere and a chance to relax a little? Consider making lunch or dinner reservations at one of the
restaurants in the Contemporary Resort, which is just a short walk or monorail ride away. Likewise, you can take a boat ride to Wilderness Lodge Resort.
Whispering Canyon Cafe is one of our favorite restaurants. While not exactly relaxing, you will definitely get your fill of food and fun!
Hope this helps. Have a magical vacation!
Diane