Like Shibuya, my little city has "quarters" as I call them, too.
The bottom right is obviously the farm quarter. The far right is the Manufacturing quarter with all my crafting buildings. The part the juts out the bottom left is my Park with tons of trees and conservatories. Connected to that, in the center of my city, is the Faerie Quarter. The sun tile paths through the faerie quarter, unlike the other city-block like ones, meander about and are conducive to getting lost lol. Top right is my new Spooky Quarter which I am SO happy to have. Between the park and the farm is the Troll Quarter. And top left is the financial district - all my coin-generating buildings. I put the jousting arena next to the Troll Quarter since they enjoy a good joust too. And it is an essential part of all the designs I've had that paths connect all buildings and all parts of the city. And walls helping to define the limits of the quarters. I also have a gate into the troll quarter from the woods for Kaz slip home some day without having to parade through the rest of town.
And I try to keep at least one of every building type out at all times. I don't collect from my market, so if a quest pops up for me to, I don't have to dig it out of storage and wait 22 hours.
I LOVE decorating my queendom - it's one of my favorite aspects of the game. And I tend to completely redecorate the entire thing about once a month.
Love this thread and hope to see more interesting parks and design philosophies!
ETA: Oops - I cut off the top of my castle! Well, I'm sure you all get the idea anyway.