Sloans Lake is a beautiful park in the city. The flat loop is just under 3 miles, making it a great easy stroll with mountain and city views or a nice place to post up and hang. It's also where we had our first date and got engaged so it's a very special spot.
Looking for an interactive, psychedelic museum ? (I mean... probably, right?)
Excellent brewery spot for a rooftop, heated view of the city and the mountains. And their pizza is pretty decent (for Denver)
Cafeteria style dining with lots of food + drink options, rooftop and patio seating.
Only 20 minutes from town, Red Rocks has several trails of varying difficulties alongside some pretty sweet views. You can also access the amphitheater and museum.