My first thought was Grand Prismatic, just after dawn.
Cool enough that the thermal features create a fog over the water, and more importantly, all the tourists (I was a hotel employee in the park) were still in bed. Had the boardwalk area all to myself.
I think I just sat in contemplation for half an hour, which if you knew me would say is impossible. Very peaceful.
As a person who sleeps through alarms and is approaching middle age…
It is a problem.
I wish I had some advice, but I am accepting advice lol.