I've done over 500 weddings so I've seen a thing or two. Please do yourself a favor and sloooww down, take a deep breath, and find happiness in the now first. Then calmly, with your FI, discuss options. You can't be in a tremendous rush to have a relaxing day! It's usually not a good idea to make decisons
when you're upset.
Also, can you get off from work a few extra days for Thanksgiving? It is your wedding, not just a vacation. And people in cold climates yearn for a beach so strongly in the winter, I think that is your best bet.
All the best,
Joel