I stayed one night in Vegas during a long solo weed smoking and LSD dropping roadtrip out west a couple years ago. Was prolly my least favorite place.[Downtown Detroit or St. Louis was 2nd]
All that desperation, desire, and glitz is no good for the soul. I could feel it creeping on me and I left as soon as I was rested up and ready to drive.
The best part of that roadtrip were the natural sights.
Grand Canyon, The Badlands, San Francisco Bay Area [tons of pelicans], Big Sur, Yellowstone Geysers, forests, and lakes, The Rocky Mountains. All were worth seeing.
I think a tie between the Badlands and Big Sur for my favorite. Looking out over the Badlands is a truly alien landscape. Big Sur just had soooo much beauty and peace.