Aloha Matherine!
Booking
Disney's Spirit of Aloha Dinner Show sounds like a great idea. Personally, I can never spend enough time at
Disney's Polynesian Village Resort. It is the most breathtaking tropical paradise.
The path you take to get back to
Disney's Coronado Springs Resort should depend, in my opinion, on whether you are attending the early or late show. If you attend the 5:15 pm show, I would hop on the water launch at the back of Disney's Polynesian Village Resort at the end of the program. That boat will take you to Magic Kingdom Park in a few short minutes. (If it's raining and blustery, take the monorail instead.) When you disembark the boat (or monorail) at the front of this theme park, board a bus headed back to Disney's Coronado Springs Resort. There shouldn't be many people looking to board a resort bus at this time of day.
If, however, you are scheduled for the second dinner show of the evening, I would follow a different plan. If you don't mind spending a little extra to expedite your trip, I heartily encourage you to reserve an inexpensive private car service to pick you up at the front of Disney's Polynesian Village Resort at the conclusion of the two-hour dinner show. The car service will then take you directly to your home resort. This will save you having to wait in what could be fairly lengthy lines to board a bus in front of Magic Kingdom Park as many guests are concluding their day there. If you decide to take a private car service, I recommend you call them at least the day prior to your dinner show.
Wishing you many magical memories on your upcoming trip,
Jill