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I find the Crawford to be the most interesting.
It’s located inside Union Station, right in the heart of downtown.
You can easily purchase a ticket and take the train from the airport directly to Union.
Inside, there are restaurants and bars.
You can hop on the 16th street mall bus (which is free) and head to more restaurants, shopping areas, theaters, and music venues.
You can even walk to the baseball stadium.
Additionally, Union Station offers connections to the light rail and buses.