I would allow about 45 minutes for travel (WL to MK)...it probably won't take that long, but the boat ride is about 10-15 minutes and the boats come about every 20 minutes. So if you just miss the boat, it might be 20 minutes before the next one comes. In terms of the meal, I tend to allow about 75-90 minutes for a non-Signatures TS meal (so, let's say 90 minutes to be safe). That means about 2 hours and 15 minutes at this point. You want to leave some time for getting into the park and finding a spot to watch from. So, all in all, I would look for an ADR in the 6:00-6:30 pm range (about three hours before the parade starts). Better to finish early and get back with time to spare than to run late and miss the start of the parade.