1. Holstein Shakes and Burgers
Located inside the Cosmopolitan, 3708 Las Vegas BLVD S, Holstein Shakes and Burgers offers a variety of tastebud-bursting milkshakes. Even better, the shakes come alongside a collection of impressive burgers. Try out their Brown Cow, Frozen Grasshopper, Oreo, Fat Boy, Campfire S'mores, or Drunken Monkey milkshakes.