Here are some must-haves if you're headed for a warm-weather Charleston, SC vacation this summer 2007:Cute Flip-FlopsJ Crew Leather Capri sandals - $48If you think you need to wear heels everywhere you go in Charleston, think again. Flip flops are not only acceptible, but pretty much the norm here - from day to night. Of course, if you're going to fancy-schmancy restaurant, you may want to take