If you've not yet experienced Mercado de Los Cielos at Desert Sky Mall, it's time to take a field trip. What was once a Mervyn's department store has been transformed into a lively Latino marketplace, the kind of place where you can buy a wedding dress, sign up for a new cellphone plan, and sit for a medical consultation with a Mexican herbalist, all without having to set foot inside the actual mall. Still, by far the best reason to visit the Mercado is to eat at its food court, a sprawling collection of food stands serving everything from Mexico City-style pambazo sandwiches to seafood platters of fresh oysters. The hardest part about eating at the Mercado is finding an empty table — the food court is a west-side weekend destination for families, and fills up quickly. Aim for a weekday supper, where you can have your pick of Mexican tortas, quesadillas, seafood, and pretty much anything else your heart and stomach desires.