We drove back up north to the Old Faithful area. We spent the whole day walking among geysers, and hot springs. We were gathering clues to figure out if a geyser was or wasn't alive. It was all part of the Young Scientist program for kids. We purchased a booklet for $5, and also checked-out a backpack with tools to help us in our investigation. The tools included a heat sensor gun, rock samples, microbes images, timer, pencils, etc. The kids were able to see Old faithful erupt twice, and truly enjoyed measuring the hot springs temperatures.
Later on, we hiked to the Mystic Falls.
We spent the night in the Madison campground.