If in the future they include maritime trade routes in American maps, the most obvious maps for this would be the Caribbean and Hispaniola. The trade route of the Caribbean map goes from being a trabois to a merchant ship. On the map Hispaniola would be something new, but if this is included it would cease to be a boring map that people almost always avoided playing.
In addition there could also be treasures in the water.
The Amazon map could have a new version where the players start on the same side of the river and there are two maritime trade routes, the first with trading posts in the part where there are players, and the other maritime route on the other side of the river where there are no There are players and would travel in the opposite direction.
Each player will have access to 2 native villages and on the other side there will be 2 more villages and many treasures.
There could also be treasures in the river.