Just got back from the Inspiration which sailed last week. They did have a special menu, but no decorations or special events. You can't beat a beach in Cozumel for Thanksgiving!
BTW here's the menu for Tday:
Fettuccini tossed in mushroom cream topped with grilled chicken tenderloins
Pan seared filet of grouper with caramelized shallot vinaigrette
Delice of the ocean, newburg style (black tiger prawns, scallops)
Tom turkey with sage and onion stuffing
Seared medallion of pork with porcini sabayon
Chateaubriand with sauce bernaise
Zucchini and eggplant parmigian.