SimCity is all about building a network of cities, one that's self sufficient or relying on others. Despite of limited city space compared to previous titles, you can create very interesting cites.
Tourist city with Elite MegaTowers! They are all connected with skybridges.
Omega city that has mostly industrial zoning. Outside of the city is Arcology which is good for most situations.
Plumbob Park, an Easter egg of The Sims. This park is cool!
