I had 8 hours to wait for an evening train, and the ticket person at the station recommended the 16th Street Mall. As others have said, this is basically a very long street that has been closed to traffic, yet there are free buses that run on solar energy that go constantly up and down the street, so you can get on and off at will.
There were a lot of interesting shops on the street here, a few souvenir stores, clothing stores, lots of restaurants of different kinds, chocolate stores, a bowling alley, movie theater, and a wonderful bookstore, The Tattered Cover Book Store.
As other people have pointed out, there were a few homeless people that were congregating in the middle of the pedestrian mall, but there was a large police presence that kept them moving, so at no time did it feel unsafe. An interesting place to visit and pass the time.
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