Playing at Holy Terror Mini Golf (609 U.S. Hwy 16A, 605/666-5170, website [1], May 15–Oct. 31 daily 9 a.m.–8 p.m., closed in off-season, adult $9, child 6–12 $7, child under 6 free) is a fun way to expend a little energy (especially for the kids) when visiting Keystone [2].
The course is nestled into the side of the mountain and the views from some of the tees are quite pretty, with the lights and hustle bustle of Keystone down below. Plan on getting a little exercise on this course, as there are more than a couple of steep climbs!
Links:
[1] http://www.presidentialwaxmuseum.com/holyterrorgolf.asp
[2] http://www.moon.com/destinations/mt-rushmore-the-black-hills/mount-rushmore-and-the-central-hills/keystone