I found this out the hard way before google maps walking time calculator when I decided to suggest walking a group from Mirage to Rio to watch Penn and Teller. I was not popular that night, especially for those in heels.

Tip for your next visit: The monorail runs on the east side of the the strip and stops off every few buildings or so. There's also a separate free tram that runs between Bellagio, Vdara, and Aria.

I am (mostly sadly) pretty well aquainted with Vegas. Unfortunately, the monorail/tram systems are pretty disjoint. And even if it just involves walking through a casino can still be quite a hike.

And I, by no means mind walking, though there was the time I went to Vegas on a business trip and was on crutches with no weight on foot allowed. Though the high point was that a porter showed me how to use the crutches more effectively; he was an (aspiring?) ballet dancer who had apparently spent more than his share of time on crutches :-)

What is the secret of crutches?

I had the same experience in Macau. The entire Cotai strip is just 3 blocks between Old Taipa and Coloane island. But you wouldn't consider crossing it on foot.