Go to multiple cities. My bro and his girlfriend went to NY, DC, Miami, Las Vegas, San Francisco, LA, Chicago, Philadelphia and Houston. All in 2 or 3 weeks. That's excluding all the natural attractions they went to, such as the Grand Canyon. Yeah, I don't really know how they managed it either. But yeah, they were pretty amazed. I think you'd be missing out on a lot if you went to just one city.