Denver Parks & Recreation's Active Older Adults (AOA) program engages adults ages 50+ in wellness, exercise, and leisure activities that support healthy aging. AOA programming includes aquatics, fitness, outdoor day trips, lunch trips, drop-in activities, clubs, arts and crafts, dance lessons, and more!
Check out all of their great programs
https://www.denvergov.org/content/denvergov/en/denver-parks-and-recreation/activities-programs/active-older-adults.html