navel warfare for lvl 50+
extend the area of water to the south of the island, add a small island for buildings, all navel buildings should be restricted to this area.
new buildings harbour - like the tavern for the purchase of basic ships (generals) and explorers specialized in finding navel adventures
new wepon smiths - cutlass maker, uses damask swords - ships cannon, uses cannon - flaming arrows, uses crossbows. this would make more use of high lvl resouces.
other buildings such as hemp farms to make rope could be added
only new navel adv would give xp to lvl 50+
basic adventures would consist of navel combat only, more advanced adventures could be split into parts, navel, and landing troops in a ship designed to carry generals, and land combat.