As far as planning your flight, you should be able to do that. If you look at Disneycruise.com the offical website they tell you that you must be on board on Saturday, June 4th at 4:00 p.m. If it's anything like the Caribbean cruises, you'd really want to get there at like noon or 1:00.
then on Saturday, June 11th we're back at the pier at 8:30 a.m. They have suggested not booking any flights before noon that day though because of possible delays.
I've been pricing out flights, about $350 out of Madison, about twice what I pay for WDW, I'm hoping the prices go down a bit.
I've been doing research on cruisecritic.com and other sites that feature ships that go to the Mexican Riviera. I found out about a horseback riding option that gets rave reviews so I booked directly with her.
If you're interested check out her website at "RandisHappyHorses.com" and then we'd be riding together on our day in Maztalan.
Brenda