What should I include in a Denver itinerary for first-time visitors?

[Adriazalez]

I'm putting together a Denver itinerary and not sure where to start. What are the top sights, neighborhoods, and day trips you'd recommend for someone visiting Denver for the first time?

 

[Ellis]

Include Union Station, Red Rocks, Denver Art Museum, Larimer Square, RiNo murals, city parks, local breweries, mountain views, and a quick day trip to Boulder or Rocky Mountain National