As noted, the higher end restaurants should have a selection or two. I have definitely had Port (or Port-style wines) at Jiko, California Grill, Il Mulino, Shula's and Citricos. That is not to say that other places do not have them. But these are the places that I can recall. Also, a really nice spot for a glass of Port would be Mizner's which is a cocktail lounge on the second floor of the Grand Floridian. This is our "go to" spot for a Single Malt at the end of a day, and I am certain that they would have some Ports, or would get you some from either Citricos or V&A, both of which are mere steps away from Mizner's.