There are several golf courses close by. The Closest is the Breckenridge Golf Course. Just about 15-20 miles away you have options of the Keystone Golf Course and the Raven Golf Course.
Breckenridge Outfitters right off of Main Street has an array of fly fishing options on the Blue River right in town
If you would like to rent bikes and ride around town, these are your guys! There is a bike path that runs from Breckenridge to Vail. If mountain biking is your style, there are tons of trails in Breckenridge from easy to really hard!
While not in Breckenridge, you can access some amazing hot springs about an hour and half south of town. Cottonwood Hot Springs and Mt. Princeton hot springs are really neat! Buena Vista, the town where you will find Cottonwood is a super cute little place to explore!
The resort offers a variety of fun activities to do in the Summer. A quick bus ride from anywhere in Breck.