Re hangzhou: The newly opened Hyatt has many flaws (construction is on going and the pool and health club are not yet open) but the restaurant is easily serving some of the best food not only in Hangzhou, nor china, but I dare say the world. Specifically they are serving a new version of Dong Po Rou that is quite simply out of this world. Really and truly spectacular. Rather then the traditional dong po rou which is large blocks of pork cooked in a red sauce their version consists of meat cut into a long (roughly five meters) razor thin strip that simply melts in your mouth, wrapped into pyramid over a bed of pickled and marinated vegetables, served with wheat ground pancakes. Truly amazing and imho opinion worth a trip to China in its own right. It is so rare and remarkable when someone is able to take a dish as timeless and classic as dong pou rou and reinvigorate it into a new creation, but they did succeed. They also offer a superb beggars chicken cooked in the traditional fashion (requires ordering the previous day). All other dishes, including the cold appetizers, were fantastic. A must visit.
Re Shanghai, there is currently a regional village food fair at cheng hua miao. The fair/fare features representatives from various small communities surrounding Shanghai and offers a good chance to sample a wide selection of regional specialties without all of the driving that would otherwise be needed. I should note that I only sampled the Zhu Jia Jiao zhong si (which I took home for next days breakfast) as I was beyond stuffed on nan xiang xiao long bao by the time I noticed the fair but it looks promising.