Fort Robinson State Park butts up against the Soldier Creek Wilderness Area (federal). Both are foot traffic or horse back only. No game carts allowed on federal wilderness property so be prepeared to drag or carry your deer out of Soldier Creek. I had a 4-mile drag last year on a buck, and a 2.5-mile drag on a whitetail doe.
Other nearby areas include Ponderosa WMA, Gilbert-Baker north of Harrison (west of Crawford), East Ash Creek, Bordeaux Creek (east Of Chardron), and Chadron State Park (south of Chadron). There are other areas as well.
These areas get a lot of traffic during the rifle season, but not so much during bow season. Fort Rob has elk, bighorn sheep, turkey, porcupines, lots of coyotes, not to mention whitetails and muleys. They do do have few moutain lions running around, but have not heard of anyone being pestered.
Cabins (especially the Adobes) are great. There are primitive campgrounds on State property with public showers and three or four camping areas with camper pads and electrical hook-ups. There is limited primitive camping at trailhead of Soldier Creek, with outhouses and hand pumps for drinking water.
I have hunted Fort Rob nearly every year since 1993, moslty rifle but a few bowhunting trips for deer and turkey, and a few flyfishing trips for brookies, browns and rainbows.