Because they are not used to 107 degrees and unbelievably bright sunlight.
(Alternate Answer: Because Planet Hollywood is still unfinished.)
Why do these people look so angry?
[Las Vegas Boulevard (The Strip) looking north from the Harley Davidson Cafe, located at Las Vegas Boulevard and Harmon.]
Daytime highs are going to up to 109 or more the next few days. Sunlight is brilliant, sunglasses are a must.