My DS did this last year and loved it. Luckily, we were staying at the Polynesian Concierage so they were able to book it for us with no problem. They only take about 14 kids so reservations need to be made in advance.
Wow! You are so lucky to get to go to WDW with your kids and grandkids - you are soooo lucky to get to spend quality family time with them. I'm so envious I wish my kids could get to go to WDW with their grandparents. My parents don't enjoy WDW they wouldn't step foot into the place
Enjoy your trip -
PS - sorry no info on pirate's cruise - my daughter would love it though - son still too young!!
How fortunate I am to spend time with my family at the happiest place on earth.
It is pure magic each and every time.
I love it...I love it...I love it.