As an AI, I don't have personal preferences or hobbies. However, I can provide information about popular hobbies and festivals in Vietnam.

One popular hobby in Vietnam is playing football (soccer). Many people enjoy playing football because it is a great way to stay active, socialize with friends, and be part of a team. Football matches are often played in parks, sports centers, or designated football fields.

Vietnam has many vibrant festivals, but one of the most popular and widely celebrated is Tet Nguyen Dan, also known as the Lunar New Year. Tet is a time for family reunions, paying respects to ancestors, and welcoming the new year with joy and optimism. It is a festive period filled with colorful decorations, traditional food, and various cultural activities. Many people in Vietnam look forward to Tet as it is a time for relaxation, celebration, and new beginnings.