I am really excited about my first sober trip as well this weekend. Used to be, my partner drank so much at night I had to babysit him, begging him to go to bed before he did anything too dumb. There was always spilled beer or vomit to clean up. He never got up until afternoons, and then was crabby.
For my part, if we weren't stationary on a beach, after an hour or 2 of hiking or sight seeing I was always starting to lean towards going back to start the nights drinking. If we were camping on the beach, I would just maintain a buzz from 6am til 2am and not do much else.
I am so looking forward to none of that, and the extra beauty I will experience. Not only will I get to SEE all the cool stuff in Yellowstone, but I will remember it all!
Hoping your trip is a blast Mark, looking forward to the pictures!