I've been working on a game as NSA to get the "Terror from the Deep" achievement -- founding all aquatic cities. Thus, I've been focusing on moving cities, including how often, and having workers around to improve the hexes after the move. Insight 1 -- many of you may have figured this out already. When a city moves onto a space, it wipes out the improvement that is already there. In my first several games, I had assumed the opposite; I worked to be sure to improve the space before the move, assuming that the city would "hover" over it. Wrong. Appears that I have been wasting worker turns making improvements that will be squished. That leads me to do a bit more planning. If I plan to move a city onto a strategic resource, I need to plan to move it again, so that I can get the resource back by improving the tile after the second move. I'm really enjoying the NSA ability to shorten the turns required for moving a city. Insight 2 -- Buying vs. Moving for acquiring nearby tiles. If I've done a good job in picking the initial city location, I may only need to move twice to get access to all the nearby resources. I then balance the cost of buying a second ring tile (to get floatstone or a food bonus) with energy against the turns/production to move the city again. If I move too often, especially in a linear fashion, I have trouble working the tiles in the city's original footprint. The costs of buying tiles goes up the more often I do it, so some thought is required. Insight 3 -- Production for Aquatic Cities. Manufactories must be build on land, not water. Thus, I have been building a lot of production-focused buildings and chose the personality trait where city production yields are buffed. What has been working well in this game is to found the city right on the coast of an island, so 2 or 3 tiles in the initial footprint are land. Subsequent moves take the city further into the water, towards resources, but I still have access to any land resource from the initial position. As I neared my desired victory condition, I moved my most productive city back towards the coast, so that I could have a coastal land hex to build the victory wonder upon.