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50 state road trip: Things to do in each state for under $20

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Colorado: Film on the Rocks
Price: $15 for general admission
Location: Outside Denver
There are plenty of things to do in Colorado, but many of them cost a lot more than $20. Held at the legendary Red Rocks venue, Film on the Rocks lets visitors watch classic films in a stadium-style rock amphitheater. Spend $15 and enjoy an incredible movie-going experience.