I have come to Vegas but have seldom stepped into M&M World. This past February my cousins wanted to go in and get some souvenirs to bring home to friends. M&M World is FOUR FLOORS with different things to look at. You can get things from cups, towels, and bags. You can customize what you want on your M&Ms but it has to be appropriate with no sexual content or explicit language. My favorite portion was the wall of M&Ms where you can create your own bag. I got a mix of mint, pretzel and crispy M&Ms. It is pricey by the pound so be mindful on how much you pack. I think I paid almost $20 for a full bag of M&Ms. Hershey Chocolate World is across the street located in New York New York so it would be good to go to both if you have the time.