Ahoy there Chris,
Sounds like you have an exciting princess and pirate evening planned. I absolutely love the
Pirates and Pals Fireworks Voyage!
Starting in April, Pirates and Pals will begin 1 hour and 30 minutes prior to the start of Wishes. From the Magic Kingdom, I would allow myself 30 minutes to walk or take the resort monorail the one stop to the Contemporary Resort and check in for your voyage.
To be safe and not be rushed, I'd plan on reservations no later than 2 1/2 hours prior to the start time of Pirates and Pals. That way you can relax in case they don't seat you right away and you will not have to rush through dinner. Cinderella's Royal Table and Pirates and Pals are both totally awesome and you should allow yourself time to get the full experiences without being rushed.
Disney has not yet posted the online calendar for June 2012 which will show the times for the fireworks each evening. They usually post their online calendars 6 months in advance. Right now the calendars are up through May 2012. I would anticipate the June 2012 calendar coming out in the next couple of days. You can keep an eye on the calendar for the Magic Kingdom by clicking
here.
Once the calendars go up, you'll have a much better idea of what time to make your reservations at Cinderella's Royal Table. Keep in mind that Pirates and Pals typically sails Friday through Monday.
Wishing you minnie magical memories :-) Allison