This Dispersed Camping area offers up a great place for group camping and abundant opportunities for wildlife viewing.
Some of my best nights in Colorado were spent in Stillwater Pass. There are numerous campsites with remade fire pits. I found this site when the Timber Creek Campground in Rocky Mountain National Park was full and I did not want to head back to Denver. There is a photo of a white plastic horse and a plastic elk. This is where you turn(hwy 4 aka Stillwater Pass).
Stillwater Pass is a dirt road but does have some damage in parts and gets rocky in others. A vehicle like a Subaru can make it though the pass with some creative driving. This is a big OHV area with trails leading every which way, so keep an eye out for dirt bikes when driving through the pass.
I have seen several moose very close to the campsites I've stayed at. There are elk, mule deer, and whitetail deer in the area too. Make sure to bring your camera! This is also a great place for long exposure night photography.