Our club(sesdaa) went to pierre this weekend and rode,it is kind of a fun area for a days ride.There are alot of hills to climb from small to large and alot of variety of other stuff to play on.It does get VERY MUDDY when it rains similar to farmingdales ,i just spent around three hours washing the heavy STICKY clay off the rzr and atvs.I want to go back when it is dry and dusty anytime.It is a good place to go for a days ride though.You can ride anywhere inside the ohv area fence although there are alot of trails and even sort of a track ,there is a total of 400 acres of riding.