I will ask around and see what kind of info I can find on GMU77 and see if I come up with any good spots to start. There are some pretty good map programs on the CO DOW site that can let you combine topo, USGS, and even aerial photos of the area.
It may be a good way to scout some of the area and find some likely spots. My best advice would be to drive your ATVs into an area and then walk at least a mile from a road to get away from the crowds. Many of todays hunters are too fat or lazy to walk a mile so if you can that gives you an advantage. Carry a GPs and mark you ATVs and any good sign that you find. Another big difference in Elk hunting is the distances that you may have to shoot, practice at ranges of 300 and 400 yds, even though I have killed many at under 100 yds. If you can hit a pie plate at 200 yds everytime from any position you are probably ok, I have my 30-06 zeroed at 200yds so I am comfortable shooting out to 500 yds if the conditions are right.