Dan Sai is really nothing more than a small town set in the scenic hills of rural Loei province. it have for a distinctive annual festival called Phi Ta Khon festival. The event attracts people from all over Thailand, foreign tourists, and as a result the city has some infrastructure .Other than the festival, Dan Sai is a rather pretty place and it would make a good to explore some of the many natural wonders of Loei province, if you're comfortable with the idea of a self-drive holiday.