Another map area to get is the Danskin Mountains between Boise and Mtn Home. Not alot of Jeep trails but some, and over 600 miles of cycle and atv trails. Mostly Forest Service roads that are for Jeeps, area closes Jan 1 to around April 1 for winter.
Backcountry Roads of Idaho is a great book available at most larger bookstores like Hastings. By Lynna Howard and her brother Leland Howard. Fantastic photos. From the back cover: "This guidebook includes; 240 pages, 114 photos, and 33 color maps. 31 Expeditions showing eight geographic regions. Detailed GPS Coordinates for each Expedition." More.
I am serious, any of the pictures should be posters on your wall.