Oh man - there's sooo much…
Hike to Mushroom Rock
Hike to Hanging Lake (reservations required)
Penny Hot Springs/Iron Mountain Hot Springs/Avalanche Ranch
Glenwood Adventure Park
Roaring Fork or Lower Colorado Rafting
Tubing from Dotsero to Bair Ranch or NN to Two Rivers
Mountain Biking all over
Doc Holliday grave
Day trip to Aspen or day trip to Vail through Indy Pass
Yoga Class at Epic Fitness or The Yoga Collective

Head to Marble for Devils Punchbowl / fill up w spring water/ see the old Lincoln memorial column.
Iron Mountain is way nicer than GWHS but it's a lot pricier. If you're going to GWHS make sure to get there EARLY or all of the chairs will be taken and most of the grass spots will be claimed.
For IM you have the kids area, the general area, and a 21+ upriver section. It's usually way more controlled of an explosion than GWHS but it's also $25 vs $44+ and includes all day access not just 3 hours.
GWHS has TONS more kids but we typically prefer the ambiance at IM.
Here's the summer concert series at 2R Park
https://www.glenwoodspringssummerofmusic.org/2023-seriesThe Third Street center in CD usually has some interesting vibes as well.
Hope you enjoy! If you have any questions, feel free to ask.
I can give ya lots of restaurants recs too

Ruedi Reservoir is also full and a blast. We went SUP there last Saturday and it was a blast. I've never seen it near this water level.
If you need to borrow inner tubes or a SUP, lmk.