I recommend visiting the Neon Museum if you're interested in the history of Las Vegas. It may not sound too exciting to walk around and look at old signs up but, I thought it was cool to be up close & our tour guide had a story to tell about most of them which made the visit more interesting.
If you're going to visit, you must see their newest "show" called Brilliant. It was very cool & you can get the tour & show as a bundled ticket.
Our Tour Guide Tom did a great job!