Choosing a trail to hike in the Black Hills is difficult when there are 450 to choose from. The views will be beautiful from them all!
Centennial Trail: https://gfp.sd.gov/userdocs/centennial-trail-brochure.pdf
Black Elk Peak: https://gfp.sd.gov/userdocs/black-elk-peak2018.pdf
Other hiking suggestions:
https://www.travelsouthdakota.com/trip-ideas/story/10-black-hills-hiking-trails