This evening we did the fairy falls hike. It was 7.2 miles, roundtrip, for us. That included a walk to the Grand Prismatic Spring overlook and also a trip up the hill after we reached Imperial Geyser, at the end of our hike. It was a cool hike because we were all by ourselves for nearly all of it. We got to eat dinner at Imperial Geyser with no one else around, no fences, and no signs.