This might sound unconventional, but if you have access to stone or marble, you might think about making this city into a wonder-spam bureaucap GP farm. The idea is, you run only engineer and priest specialists, workshop the land, and accumulate GP rate through wonder-spam (+ with a little help from as many hammer-producing specialists as you can fit in). You've already got decent production with the 3 grassland hills and the quarry. And you've got all the food in the world with which to work 1f/2h or 1f/3h grassland workshop tiles. With workshops/watermills + bureaucracy + the eventual levee, this city could be a production beast, if you were so inclined.
Or, a more traditional cottage+spam bureaucap would work well. I would not make the city into a regular GP farm because you're gonna wanna work that luscious land...but then again, you'll have more food than you know what to do with if you opt for a regular cottage-spam bureaucap. A hammer-oriented bureaucap would make good use of the food. Really, it depends on whether you need production vs. research more urgently.
You could also do a hammer-heavy bureaucap, but instead of using the hammers for wonder-spam, you could also throw the heroic epic in there and crank out 1 unit/turn for all of eternity. Which of course depends on the diplomatic situation. Your call.