The Grand Floridian is located on a monorail line that is free to use. You can easily spend an evening riding the monorail and exploring the 3 hotels there. You could even transfer to another free monorail and ride to Epcot. You don't have to pay to enter the park, but the monorail will make the loop through the park and you can sightsee and then stay on the train for the return trip.
You will also be able to see the 7 Seas Lagoon, the lights of Magic Kingdom, and watch the MK fireworks show ("Wishes") if you are outdoors at the right time of night.
There are quick service, fine dining, and midrange restaurants at all 3 hotels, as well as lounges. (The Polynesian, the Contemporary, and the Grand Floridian are the locations you can visit.) Again, for the best selection, try to get a dining reservation, and check a day or 2 before your visit if you aren't finding something to your liking now.
The Electric Water Pageant is a short 10 min show that is a lighted water parade set to music that you can watch from the marina.
An evening such as this can be as cheap as sandwiches and drinks, or you can splurge on a 5-star meal. It's up to you.
I am confused about your husband's park entrance being included with golf. I have never heard of that before.