DK's Boat

From the Super Mario Wiki

DK's Boat is a boat that belongs to Donkey Kong in Mario Party 6. He rides it around Castaway Bay. If a character lands on it, Donkey Kong will give the character a star.

Landing on a ? Space will make the DK Boat move so whoever lands on the Star Space next gets to see Bowser's Battle Yaht and not the boat.

Watercraft
Bessie Bass's Battleship | Black Skull | Blackbeard Koopa's Ship | Bowser's Battle Yacht | DK Cruiser | DK's Boat | Daisy Cruiser | Ding Bell | Gangplank Galleon | Hover Craft (DKC3) | Hovercraft (DKR) | Motor Boat | MSS Sea Star | Peapod | Pirate Ship (3 on 3) | Pirate Ship (SSBB) | S.S. Caviar | S.S. Chuckola | S.S. Flavion | SS Tea Cup | Shakedown Schooner | Sinister Star | Sunken Ghost Ship | Sunken Ship | Turbo Ski
Submarines
Bowser's Sub | Doomsub | Knautilus | Koopilus | Marine Pop | Subwarine | Yoshi Submarine