Apparently, the answer is cruise ships, or specifically, Carnival Cruise Line Tycoon 2005: Island Hopping, the latest tycoon game from Activision Value to be based on a licensed franchise.

Carnival Cruise Line Tycoon 2005: Island Hopping is on the bad side of the games I've played over the course of my life, and I've played some pretty bad ones. The game doesn't sound too ...