To me an ideal city would have a large amount of public transportation, trains, subways, electric buses and taxis, plenty of fast constant shuttles betweens lines, probably monorails like many airports are adding. Sports Stadiums built on transportation hubs, lots of parks, lots of good strong neighborhoods, large walking districts for business and shopping where only subways or quiet elevated monorails exist so there is zero traffic. I would like the city to be as clean as Vancouver was in the mid-eighties. This should be kept a priority.
Every neighborhood should have its small businesses. Bars, restaurants, coffee houses, bakeries, grocers, hardware stores, etc. The school system should be a high priority. Hospitals and city services should be well distributed. The city would be rich with culture, Museums, Zoos, Aquariums, Theaters, etc. It should have several amusement parks. It should have lots of parks with ball fields.
The Business District should have towering skyscrapers and be in the center of the city. The Business District should have an elevated walkway system similar to Minneapolis. That was the best feature of Minneapolis I noticed in my brief visit.
It needs a good airport with easy rail access to the city, but outside the city. It needs suburbs that are not contiguous with the city, but more like miniature satellites of the city with there own robust town centers and excellent transit to the city and a good rail system connecting them to each other. Buffers between the large suburban towns and the City should be largely farming and parks. It needs an excellent water and electrical supply.
The city should be built for good traffic flow, where traffic is allowed. Walking, Biking, and mass transit must be the priority however.
Basically take all the features of NYC and reorganize it, clean it up, built the city largely circular around Downtown, move the stadiums near the downtown and massive increase and improve the mass transit. Push the burbs at least 10 miles away from the city. Add in some monorails, an electric bus system, and the Minneapolis walkways.
Jim