My first try of the Great Lake city, not the best, I did not bother much with planning just wanted to make some test of the playability.
City is divided basically on two big parts - first one - luxury with rich plebes (almost ALL GI) and patricians (LP) (everything almost symmetrical), another one - a large crummy village nearby (large casas) to meet the population requirement. In the "getto village city" there is also large cultural parks to meet 90 culture. All people are fed and happy. Adding a few cultural buildings for 90 culture will instantly end the game. Unemployment is 11% so 100 culture is not a problem in 1-2 months.