We just got back from Deadwood, this was our second year in a row 4Wheeling in this area. We camp at Mystic Hills Resort on Custer Peak Road off 385, they also have cabins. If you haven't picked up one of the Forest Dept. maps at the Tourist Info stops along 90, Steve and Cheryl will have them and will be happy to mark the Trails for you. Something for everyone, very scenic and can be challenging. Nemo and the Centennial Trail some of the best riding around. Check out the Mystic Hills website, there are maps available and lots of info. This whole area is very ATV friendly, can't wait to go back next year.......
BTW. you do not need a 'sticker' however, next year you will have to register your machine in SD. never heard of out of state machines not being allowed anywhere.
Enjoy