On your last day in Yen Bai, immerse yourself in the local culture and traditions. Visit the local ethnic minority villages, such as the Thai, H'mong, or Dao villages, and learn about their unique customs and way of life. Participate in traditional activities like making handicrafts, weaving, or cooking local dishes. End your trip with a visit to the Thac Ba Lake, where you can relax and enjoy the scenic beauty before heading back home.