The road to Four Peaks is not a challenge at all, and I don't recall any optional obstacles unless they're way off the road. There may be some challenges to be found with some exploring further off the road, but the 4 Peaks road is barely more difficult than the main road up to Crown King.

95 Montero SR
3.8 MIVEC, Advance headers, 2 1/2" exhaust, Magnaflow muffler, OME shocks & rear springs, 2" body lift, 3" tank lift, 4.90s, TRE front locker, factory rear locker, Roger Brown Rock Sliderz, 315/75r16 (35") tires, Sport big brakes