Serendipity is a tourist trap with long lines and an overrated novelty concept that overshadows the fact that this place is just a diner with a made-up tale. It's whimsical, it's fun, it's young and hip: everything people desire in order to feel like they're a kid again.
My friends and I tried their frozen hot chocolate. Though they were ecstatic to be out of the sun and to drink something cold that isn't soda, water, or frozen daiquiris, I wasn't impress at all. The drink was presented in a glass crystal-like cup topped off with a huge dollop of whipped cream. The frozen hot chocolate was basically ice blended together with hot coco mix, milk, sugar, and shaved chocolate; nothing special at all.
It's a small place, yet people go crazy over a poorly executed concept, which is a lost to me. Another commercially gimmick for wandering tourists who want relief from the Las Vegas heat, I won't be returning any time soon.