I'd take the 16-50, the 85 f/1.4, and the 70-300. Leave the flashes at home or stick the SB600 in there if you insist. That setup gives you great coverage of the full range without much overlap. This assumes that the 16-50 is good at f/2.8. If not, I'd replace it with the 35 f/2 because on the cruise you'll need to be able to use f/2.8 or lower at the 35mm range.
Sounds like so much fun. We went on a cruise last summer. I used my 17-55 f2.8 the most. Bet your Tokina will serve you well. The 35 f2 might be fun because you could use it for macro type shots and in lower light situations.
I bet your kids are going to LOVE the trip. Can't wait to see some photos.
I think Paul's solution is the best - walking around at Disney you'll want to travel light. I used a 24-120 and 70-300 when I was there. Used the 24-120 the most but there were those shots of the kids on rides that required the use of the 70-300.
Have a great time and be sure to visit 'It's a Small World' - that song will never leave your head!!!! (evil laugh)