Since the cruise is pretty late, I'd think you could eat anywhere you want, lol. We're looking at 'Ohana in the Poly before a Wishes Specialty cruise. If you want to stay in the Cont you have three great restaurants to choose from there - Calif Grill, Concourse Steakhouse, and Chef Mickey's. You don't mention kids in your party, but Chef Mickey's is a great treat for kids and adults alike, lol. In all seriousness you could eat at any of the monorail resort restaurants or even the WL and take the boat ramp to the Cont before your cruise.
Please be sure to post about the cruise when you return as we're not going til December and I haven't heard much about Wishes cruises just Illum cruises.