Allearsnet.com has info about this:
Pirate Adventure - Children wear pirate bandannas and follow clues to search Bay Lake and the Seven Seas Lagoon for buried treasure. They sail to many exotic "ports of call" (Resort Marinas) to collect treasure. Children who are potty trained (no pull-ups) and ages 4-10 may attend. Lunch is provided (Peanut Butter and Jelly Sandwich, Gummy bears, Krispy Treat and Juice box).
Monday, Wednesday, Thursday and Saturday 9:30 - 11:30 a.m.
Available to all guests, Cost is $28.17 plus tax.
Reservations 90 days in advance 407-WDW-DINE
"We did this the last day and it was probably my boys' favorite activity. They get a pirate hat with Mickey ears, available no where else. They load up on a boat with a Jolly Roger flag and go around the lake looking for treasure. I'm not sure exactly what they do because parents don't get to go along. But they come back with a bag full of loot and grinning from ear to ear, saying all kinds of pirate lingo. That's when my boys decided we could just live at the Grand Floridian!" Carie Lackey, 6/03
"We made reservations yesterday and were told tennis shoes (sneakers) and socks were now required for the child." Jennifer, 10/8/03
hth!