I was wondering if you guys could advice me on this. Which one of the three cities in "mainland china" are best for a day trip? I can only do one so I need to chose wisely. My buddy and I are artist types, photographer and painter.. If that maybe helps you advise us better and we are also on a budget... Does it take long to go through Chinese customs and on the way back to HK is it a long cue? or any other things we need to know? Thanks a lot.