Here's mine. Feel free to expand on this one and suggest changes, in addition to posting your own game types.
Treasure Hunt
This idea was, obviously, pirate-inspired and is pretty simple.
Two teams spawn in boats on opposite sides of a randomly chosen island map. Somewhere on the island (should it be in a random location?) is a treasure. Upon finding the treasure's location (it wouldn't be on the map, but the spot would be marked on the ground somehow) it would have to be dug up. Once in hand, the opposing team would see a message saying that the other team has found the treasure. The first team to get the treasure back to their boat with their entire team on board, and hold it there for a certain amount of time, wins.An additional idea would be to add a dummy treasure. It's not buried, but otherwise looks exactly like the real one and still causes a "Team *blank* has the treasure!" message to be displayed. Once you have the dummy, your team recieves a message letting them know it's a fake. I don't know if this particular idea has actual merit, and would add anything to the game. Just seemed like something worth throwing out there.

