We will be in Xian in September. Flying in from Beijing in the morning and staying 1 night. Flying to Guilin early evening of 2nd day. Having two partial days and 1 night there. We will be seeing the Terracotta Warriors for sure, but what also is recommended for Xian for a short stay and not to miss. Have read that renting a bike and riding on the wall is great. What is a "moto guy" that can drive one around on the city wall? Heard Muslim quarter is great. Drum and Bell Towers of course. Anything else doable in this short of time? Thank you.