Sanjay Gupta: (on amenities he would place near by a city to make it livable) Too many of our cities are built with an eye toward commerce, instead of health. As a result, we have parking structures instead of parks and roads instead of walkways. There are plenty of examples where you can do both. Healthier cities are successful cities. I would focus on increasing the amount of green space, because it is good for the earth and for our own bodies. I might buy thousands of bikes, paint them a really ugly color (so people wouldn't steal them...) and simply distribute them around a city. I would paint quarter mile markers on every walkway, so citizens could always have feedback on how far they are walking. I would also want to see urban gardens like they have in the south side of Chicago. Teaching my kids to garden would provide immeasurable rewards both for them and for their community.