I made it out to RMNP last year. It was awesome, in the literal sense of the word. I hope to get back sometime soon.
A few years ago, the kids and I hiked one of the paths up and over a small hump in the mtns there and back down to the car. Was about 7 miles. We decided to lunch at a small pond and as we were sitting there, the elk moved in to graze. We got up on a big rock to stay out of their way, and we could literally reach out from that rock and touch them.
I have not had the luck to see the bighorn sheep yet.