Since we already have a City themed, a Desert Themed, why not add a series of Islands themed map.
The Boats that have guns will now be actual usefull! They can join the firefights, kill people when they're driving a boat, a Balanced firefight and a good overall experience.
My reference is the Falkland Islands, because it is literally the perfect island to make map of this kind, you guys can like improve with adding some bridges, or for engineers, make them have like a new Small Bridge to connect an island to another without going to the water.
Basically we want more fun and adding this will I think complete the theme allot.
Preview of the map;