I'm trying to plan a Vegas weekend trip for a group of people (3-4 rooms) at either Aria or Cosmo. What's the best way to maximize the miles out of this trip? I'm looking for US airways miles, Chase UR, or UA/CO miles (ranked in that order). I could either a) book using my SPG, get 1.25 US mile/$ b) book through UR mall and hotels.com to get 4pts/$. Do I get an extra pt/$ with my ink bold since it's 2x on hotels? c) use marriott rewards somehow for stays at the cosmo. (any marriott experts out there than can help?) So far I'm leaning towards b) but I'm hoping for a better way to get US miles than a).