Unless it’s ‘bigger is better, ’ there’s no real theme at the Strip’s most staid megaresort, with a football-field-sized casino overhung by twinkling chandeliers and overstuffed blue-velvet chairs. But Bally’s biggest attractions are not about gaming. Jubilee! is one of Vegas’ long-running showgirl extravaganzas. After performances, the leggy dancers often pose for their over-the-hill admirers at the casino’s Indigo lounge. Or visitors can peek behind the curtains on a backstage tour. The monorail station is at the back, and an interior walkway connects to Paris Las Vegas.