We hiked the Nymph (above), Dream, and Emerald Lake trails during one of our days in the park. That same day we tackled the Lake Haiyaha trail, too, which was one of our favorite hikes while we were there. While there were a lot of people on the Nymph/Dream/Emerald Lake trails, you lost a lot of people on the Lake Haiyaha trail due to the rapid increase in altitude. It was much more secluded and the lake was by far the most beautiful of the four. I've included one of the Lake Haiyaha pictures at the end.
A view from Trail Ridge Road
Emerald Lake
The trails around Emerald Lake
The trails around Emerald Lake
Lake Haiyaha
This lake was the most beautiful aqua color, and so clear you could see straight to the bottom. It was surrounded by huge boulders, too.