We heard from several people that Boulder is a really nice city and we decided to check it our before our flight as we had several hours left. And it is very nice indeed. We liked walking in the downtown and in the University area. Also, hiking in the Chautauqua area is enjoyable as you can see from the pictures below. As there is a University there were hundreds of students everywhere which made the city look vibrant and attractive. So far Boulder looks like one of the best cities to live for young families in the US.