Actually, the best pirate-style ship around is the Seatraveler. It is a .3ds model but imports fully textured and very detailed into Poser. Also, the Medusa by Faveral at Daz is also nice and was on sale recently. They are the tall sail ships of the 1700s and 1800s. You could turn them into a fairy boat by changeing materials and scaling it down. There is also a free leafboat in freestuff here, I think.