Hey there, hi there Marissa,
Thanks for stopping by planDisney! It sounds like you are planning one magical Disney day that's coming up soon. Adding on the
Park Hopper Option to your ticket is a great way to be able to experience your "must do" attractions in each park, especially when you have limited time.
You only need to
make a reservation for the first park that you plan on visiting. It sounds like you'll be visiting
EPCOT first. With a Park Hopper Option you can head to
Magic Kingdom around 2 PM. You could even visit all four parks in the same day if you were really adventurous.
Both parks close at 9 PM on March 1, but EPCOT opens an hour later than Magic Kingdom. Unless the reason you are planning to close your day in Magic Kingdom is so you can view
Disney Enchantment and see fireworks over Cinderella Castle or have dining plans in Magic Kingdom, you may want to consider switching your reservation to make Magic Kingdom the park you go to in the morning and EPCOT the park you hop to.
Harmonious is an equally amazing nighttime show in EPCOT, and you'll get more park time out of your day. Although I think you are in for a magical experience either way.
While park hopping is subject to availability, keep in mind that other guests will have Park Hopper tickets as well, so generally, as everyone starts to return to their resorts in the afternoon or heads off to a different park, there will most likely be availability for guests who want to switch parks.
If for some reason your Park Hopper is unavailable, you'll be alerted through a push notification on
My Disney Experience app. You can also call the Park Hopper hotline before you plan to switch parks at 1-407-560-5000.
Hope this helps. Have a magical day!
Diane