Las Vegas: Travel north on the Strip, past the glittering islands of the Bellagio, Excalibur, Venetian and other resorts, and — keep going — it finally appears like a worn-out showgirl at the end of a parade: downtown. Here, Binion's, Main Street Station, Four Queens and other casinos — "vintage Las Vegas," as downtown's promoters like to call it — beckon the budget-conscious amid wedding chapels, older bars, check-cashing stores and a few newer attractions like an outlet mall.