Hi, Lindsey!
Now that's what I like to hear - enjoy every second of your magical vacation! It sounds like you have a super first night planned.
I do not know if there is an official time they stop letting guests enter the theme parks at the end of the day, but the latest I have entered was about 30 minutes prior to closing. Last summer,my family and I arrived late in the day, but knew we had time for one quick ride on Expedition Everest, so we got to Disney's Animal Kingdom 30 minutes prior to closing, rode our one ride, then we were done! (Thankfully we have
Annual Passes, otherwise we would have had to use a day of ticket for one ride, but really, we had so much fun it would have almost been worth it!) Sometimes it is that spur of the moment activity that makes a vacation special!
Certainly, if you have a few hours, you will be allowed to enter
Disney's Hollywood Studios. If you do this, make sure you still have plenty of remaining park days on your tickets to cover the rest of your vacation. If you need to add days to your
ticket, stop by any ticket window before using your last day and you can add onto your existing ticket.
I hope all of your vacation days in Walt Disney World are as magical as the first!
Cathy