Here are a few off the top of my head:
* Top of the Harbourtown lighthouse
* The fishing pier at the Disney resort overlooking the marsh
* On a dolphin cruise from the resort. (The resort uses smaller boats than other tour companies, so they could probably arrange to have a tour just for the two of them. The captain and/or the CMs at the resort can probably also do something to make it even more special.)
* Having a drink or dinner at the Old Fort Pub at sunset
* While watching the fireworks on Tuesday night
Best of luck to them!!