My brother and I went to Colorado to do some off-roading this past week. I was in my G500 and he had his Jeep Wrangler Rubicon. We first stopped in Denver...nice town! Next, we went to the Rocky Mountain National Park, where we off-roaded on North Supply Creek (west of Grand Lake and Rocky Moutain NP; mild-moderate terrain) and Kawuneeche Road (easy terrain).
The following day, we met up with another G-wagen owner (whom i met on the G-forum). He has a 1995 G320. He off-roads in these Passes 3-4 times a week! Thus, he knows these Passes very well.
This is at the entrance of Engineer Pass (moderate). During the trip thru Engineer, we also took on some "optional" obstacles.