Copenhagen is great. One of the things that makes it so is that the city is continually trying to find ways to make biking and walking better for its citizens. And one way they are doing that now is by erecting many bridges (especially over their harbor) that are car-free, which helps take the stress off of current routes that have become congested with bicycling.
Marie Kastrup, the Bicycle Program Manager for the City of Copenhagen, was very kind to take me on a tour of just some of the bike & ped bridges Copenhagen has constructed in the past years. And the amazing thing is: there are even more on the way.
Every major city should be looking at their waterfronts and making it easier to cross bodies of water. I would love to see some new crossings over the East River in NYC. If you are a cyclist and want to go between boroughs, sometimes it is very, very tough.