Anyone with a Denver Public Library card — free to anyone in the city — has access to the library's museum and cultural pass program, which offers library patrons the chance to reserve passes to most of the metro area's many cultural attractions, from the Denver Museum of Nature & Science to Dinosaur Ridge. Spots can fill up quickly, as passes are released on a rolling basis, but for culture vultures, this is an unbeatable deal.
denverlibrary.org/museum-passes