Turpan one day tour include following tourist sites : 

1. Jiao he ruins  - one of the main city on the silk road 

2.Imin minaret  - Build by locak ruler in 1777

3.karez underground water  -  irrigation system  , one of he 3 famous constrcution in China 

4.Flaming mountains   - its mentioned Chineses classical novel " Journey to the west " 

5.Toyuk old Uyghur village   - Its still not touched by modern life 

6.Gaochang ruins - Fomer Uygur kingdom's capital 

7.Kumtagh sand dunes  - means Sand mountains 

we can do this tour within 2 days , all depends on your arrival time to Turpan