I booked my PS for the Luau dinner show last week for my arrival date 10/29!!!

I hope I didnt make a mistake in booking the Luau over the HDD but I reallly want to go to the Luau. Maybe next time I will do the HDD.
Now, I had my choice of 2 seatings, 5:15pm or 8:00pm and I booked the 8pm show because I heard it is better when it's "dark" out.
It will be my arrival day in Orlando, and I hope to book my airline tickets soon, and Iam hoping for a 7:30am flight out of EWR arriving MCO around 10:30am or so. We will be tired and hungry by 8pm but I also wanted this to be a day to kick back and enjoy the resort a little.
Do you guys think I should change to the 5:15 show or take a nap at the hotel after check-in after a Big Lunch and where is a good place to eat a big lunch like that? I will be on the new dining plan but dont want to use up a meal option for lunch that day as I will lose 2 meals for the Luau show.
Any input is appreciated!!!
