Hi, here it is: terracotta warriors (bing ma yong 兵马俑), big wild goose pagoda （da yan ta 大雁塔）, huaqing hot springs （hua qing chi华清池）, dumplings dinner （jiao zi yan饺子宴） as well as the famous tang dynasty show （tang ge wu 唐歌舞）
A notice for you, there are different places to have the dumpling dinner and Tang Dynasty show. Some place combines the dinner and the show. If you want to find them, you should know the place too. I have tried the dumpling dinner in an old restaurant called Tong Sheng Xiang, next to the Drum Tower. Very nice.