We came to Serendipity for breakfast on our last day in Vegas. I had no idea they even served breakfast since I'd only heard of their famous desserts (i.e. their frozen hot chocolate).
After eating at Serendipity, I feel like it's definitely one of those places that should specialize and serve only one type of food (basically they should stick to desserts). It's not that their food was bad - I thoroughly enjoyed my omelette - I just thought they were trying to cater to everyone when they should just have desserts. I'm sure that if I had dessert that my rating would be higher but for right now, 3 STARS. They did have a bunch of breakfast/brunch options but they were a little pricey.
Service was easily 5 STARS - our server was kind, knowledgeable about the menu, and very attentive.
I think if you're scrambling to find a breakfast spot, Serendipity is an okay choice but otherwise just stick to desserts here.