These were my recommendations from an older thread:
Hike, paddleboard or canoe, and have lunch at Piney Lake (rough drive, but beautiful once you are there)
https://www.pineyriverran...ranch.com/
Whitewater rafting -- we like these guys out of Glenwood (assuming no mudslide issues on I-70 through Glenwood Canyon):
https://www.coloradowhite...fting.com/
Less dramatic than rafting but still fun -- tubing on the Colorado River
https://turtletubing.com/
Horseback riding at Beaver Creek Stables or Vail Stables
Some summers 4 Eagle Ranch has hayride/cowboy dinners -- programming tends to change year to year
https://4eagleranch.com/
Take Lionshead Gondola up the mountain, ride the alpine coaster at the top, take some beautiful pictures overlooking Holy Cross, and do a nice easy hike with great views on Fireweed Trail over to Gondola One. Take Gondola One down, stroll through Vail Village, wade in Gore Creek, and make your way back to Lionshead parking garage (walk behind the library along the creek)
Betty Ford Alpine Garden (great playground there as well, wade in creek down by covered bridge). Check to see if there is a performance at Ford Amphitheater that you’d enjoy.
Vail and Minturn farmers' markets (Vail market much bigger/more crowded)
Lunch hike with a llama via Paragon Guides
For Aspen: we like the Gant for condos - good location, nice pool. Maroon Bells is a must - bus system works well, and you might not be allowed to drive up depending on timing. Rent bikes for a nice ride to Woody Creek tavern. Same recommendation as above for Glenwood rafting. Visit/hike around Ashcroft ghost town. Look into dinner at Pine Creek Cookhouse and any performances at the Music Festival.
Have a wonderful trip!