I was in Vegas for a week back in March, I walked about 35 miles the whole time. I think about half of it in one day that I had entirely to myself. It was way more enjoyable than spending time time in the car, basically the longest bar crawl I've ever been on lol

I tried not to cross the strip (on the street) too much, but it wasn't impossible. The pedestrian bridges were great.

I'm sure my experience is far from the average though.