If you want to visit the most unspoiled market in the Sapa region, go to Coc Ly. This town lies 60 miles from Sapa (95km). It will take you two and a half hours to get to Coc Ly. The market takes place on Tuesdays mornings.
You should leave Sapa at 7 am in order to get there around 10 am. In this market you will see people belonging to the following ethnic minorities: Black Dao, Flower C'mon, Fula, Lachi, Nung, Sandui and Tay.
If you book one of the tours, you will also have the chance to do a boat tour along an extraordinary landscape. On the boat trip you will see many caves.