Pretty vague request...
Have either of you been out here before?
Downtown Denver is just like any other city, you will find anything and everything you would normally find in a city, plus a pot shop or two!
Foothills- a day trip up to Idaho Springs or Evergreen will give you a taste of the mountains. A little bit longer trips- head up to Rocky Mountain National Park in Northern CO; Garden of the Gods and other sites around CO Springs to the South.
Lots of breweries if that's your thing as well as distilleries.
Aviation- Wings over the Rockies is worth a visit. If you want to watch an awesome sunset over the mountains as well as the busiest non-commercial airport in the nation, The Perfect Landing had a really good happy hour for foods and drinks every day at Centennial Airport.