My most memorable trip was the one to China. It was absolutely amazing. Aside from the Great Wall, Tiannamen square, Forbidden City, and Temple of Heaven, the most outstanding day was spent in a local village with a family. We had tea with them, then cooked dumplings with them. After that they cooked dinner and there were so many dishes I couldn't count. After that we walked to the town center where the women of the village performed this dance/aerobics thing. We then joined them and had such fun mingling with the locals.
Although we went to other cities, the time in Beijing was outstanding. It's a trip I will never forget.