We board Memo's ship with 4 adult and 6 kids, ages 4 through 10. EVERYONE (adults included) had an awesome time! The crew goes all out to entertain the kids, but includes the adults too, if they want. It's water gun fights -- and more!
We took the sunset cruise in October and the weather was perfect. We really enjoyed the sail around the area as well, while the kids were goofing around with the other pirates. For adults, they served beer and wine (included) and the kids helped themselves to beverages at the bar. They offered an "upsell" rum drink that was yummy and you could get in a souvenir cup.
I highly recommend this cruise for families with younger kids. It's not scary (though my little one kept asking about where Blackbeard was!) and filled with fun.