Loving the game so far. I wish I could call in sick (again) and continue playing.
One area* that I feel has lots of unrealized potential is in the Seafaring tech. There's so much coolness that could be added. A few thoughts:
*Fisheries / fishing vessels: a new resource for food
*Different types of vessels and game mechanics: warships (sea battles), trading...
*Sea monsters & summonable aquatic units (bring forth the kraken!)
*Archipelago type maps
*Goodie huts accessible by water only (octopus' garden, siren's cave, etc..)
That's just off the top of my head...
*I searched for a similar post talking about seafaring but didn't find one. Apologies if this has already been discussed (please give me the link so I can see)