That's a nice park with some good trails. I heights aren't your thing I could see that path being a little more than distressing! I love the mountains, and the Rockies have a lot to offer! Just a bit of trivia, the mountain range of the Rockies runs from Canada down to the southern end of South America!
Great shots, you can very easily get winded at those altitudes coming form 600 feet. Last time I was at 8000 feet it was very hard to do any serious physical exertion!
All the parks have that system now, especially the National Parks. It does make them less crowded which is nice, because places like Zion's in Utah and Yellowstone in Wyoming/Montana are really crowded anymore.
What a trip! I can't wait to see more pictures! Looks like you guys made the most of that trip!