My best suggestion for "bouldering" or rock climbing in the Black Hills is our very own Upper Chautauqua Park which you will find if you follow the street beyond Evans Plunge (keep to the left). Address: Co Rd 18B, Hot Springs, SD 57747. The only precautions I have for an experienced climber in this area are related to critters. While black bears are not a common occurrence in the Black Hills, there have been several black bear sightings in this canyon. Bring a can of Bear Mace with you. There are also cougars and bobcats here, and the methods of scaring them away from you are different than what you would use in the event of a black bear attack. I do not know if Bear Mace is a deterrent for the big cats, but it wouldn't hurt to have some with you just in case. Black bears are native to the Black Hills, but have been gone for over 100 years. The past few years have seen a resurgence of them. We are unsure where they are migrating from, but most likely Yellowstone in Wyoming. The creek flowing through this canyon is called "Hot Brook" and for good reason. It is warm year around. I've never seen any areas that are actually HOT, but that is not to say they don't exist. From: https://youtu.be/eaq8Ax-7JZs?si=gRFu199AIRNsesdK