Going west from Estes Park just follow the signs to the enty points of Rocky Mountain National Park. Best elk viewing is in late September in the early morning or evening. Look for all the cars!
Give them their space, you don't want to get arrested, much less find yourself between a bull elk and his harem!
Ah, the Autumn Rut is on! And the biggest, most aggressive set of antlers will be victorious in gathering a harem. This guy is destined for success.