Bighorn Rentals Keystone condos are located in the Keystone Resort, within a half mile of ski lifts, restaurants and shops. The Arapahoe Basin ski area is five miles from the property. The Copper Mountain ski area is 15 miles away. Common area outdoor spa tubs are available at the property. Parking is complimentary. Please come to the check-in office located at 110 S. First Ave. Frisco, CO 80443. Minimum age required at check-in is 21. Check-in is at 3pm. Check-out is 10am. Please come to the check-in office located at 110 S. First Ave. Frisco, CO 80443. Minimum age required at check-in is 21. Keystone offers everything you could possibly desire for a memorable winter vacation. With three different mountains to choose from and two mountain villages to entertain you and your friends or family, Keystone will keep you coming back for more.