The M stands for Mars, the name of the family (headed by Ethel in the early days) that brings you Snickers, Milky Way, Three Musketeers, and M&M's. Come here for two special reasons: one, to watch the candy making, and two (more important), to taste free samples in the adjoining shop. As for the other half of this place's name, yes, there is, indeed, a cactus garden—Nevada's largest—with more than 350 species of succulents and desert plants. It's at its
peak during spring flowering. The factory tour and gardens are free, but if you forget to go, McCarran International Airport features branches at all gates after airport security.