Depends on your definition of fun...lol.
Don't expect too much "fun" until after Recognition. There are sporting events on campus throughout the year, but my Doolie did not attend, except for mandatory football games, because it's "not worth it" to travel across campus unrecognized. He spent most of his time in class, library, and his room.
My Doolie hiked up Eagle's peak about 3 times before it got snowy/icy.
He also spends most weekends at his sponsor's house to relax, attend church, eat somewhere other than Mitch's. He went on 3 retreats, one of which included snow skiing. Upperclassmen with vehicles ski more regularly.
There are sand volleyball courts, cadet gym, and he went bowling once I think.
Now that he's recognized, he's planning to see a Rockies baseball game and will venture off base into the Springs more.