Hi,
I didn't found this idea yet, so don't kill me if i missed it.
It would be great if it was possible that you could keep the islands you have conquered from an adventure. So you get more space to build, maybe special resources..greater amount. It would open a lot of new potential game features. Like sending resources from island by island, by ships...which you need to build offcourse. You could make a PvP option in it, that you could attack someone else his island. To defend your island you can build defense towers(like in the real settlers games).
The dimension and possibilities would be huge.
See Ya around.