owner or Acme Bicyles in Rapid City, I can't think of his name right now, but he'd be able to tell you. The number is (605) 343-9534. He's a great guy, an avid rider and knows most of the trails around the area. I don't know of anything close to Hot Springs (depending on your definision of close), but it's been a long time since I've been there. But there's allot of new stuff that's been created over the last 7 to 10 years. Anyway give Acme a call, I'm sure they'll know of something within a reasonable distance of HS. There's even some riding available right in Rapid City, no epics, but techinical for sure. Rapid is about 60 miles north of Hot Springs. Anyway I'd start there for info.