www.allearsnet.com says :
Wishes Cruises are available, leaving from any of the Magic Kingdom area resort marinas. There are two choices, the Pontoon Basic and the Pontoon Premium. As with the IllumiNations cruises, when you rent either boat, it belongs to your party for the show; meaning the only people there will be the ones you've invited!
Pontoon Basic: A 21-foot pontoon boat, which seats a maximum of 8. The price for the Pontoon Basic is $187.79 + tax, and the cost includes a driver, bagged snacks (pretzels, chips, popcorn), water and Coke products. Audio from Wishes is NOT piped in to the Pontoon Basic.
Pontoon Premium: A 24-foot pontoon boat, which seats a maximum of 10. The price for the Pontoon Premium is $234.74 + tax, and the cost includes a driver, bagged snacks (pretzels, chips, popcorn), water and Coke products. Audio from Wishes IS piped in to the Pontoon Premium.
I am going to try to do the impossible and book both as a post reception since the grand 1 only holds 14