I do not know of any "bingo parlors" in Deadwood, only casinos. I can, however, highly recommend Andy's Trail Rides located south of Lead on Deer Mountain Road. This trail ride is the best we have been on. Not your typical nose-to-tail, follow-th-leader type ride. The horses are well trained and cared for and well matched to the riders capability. Andy allows you to chose your gate but encourages those with no experience to take things slow. Because of our experience we were allowed to lope and even gallop when conditions were safe. The trails were secluded and the scenery gorgeous. Andy and his staff were very personable and knowlegeable horseman/woman. I have included his website for you to check out.
http://www.andystrailrides.com/