ugh my problem with Cities is my favourite parts are the struggles of nurturing it during the turmoils of the beginning. It's a pretty ez-mode game once you get everything up and running and spend your money wisely. I booted up my city the way I left it last night and shut down after about 20 minutes cause it just wasn't challenging anymore. :(
I think the next best thing to do would be to have infinite money and just work on building gigantic metropolises with highways running inside, high density everything and work through those issues. But even then, is that fun or just a chore?