Seems all the American parks are pretty populated most of the time haha. It's unfortunate in a way, but I would still like to visit them at some point.
I love all of the colors you've captured here! I really like the composition and I think the leaves and the water flowing over the edge compliment the scene nicely.
It's called the Subway and it's in the Kolob Canyon section of Zion National Park in Southern Utah. Just ask the rangers for a permit if you're in the area and want to go.