This document contains 4 sample letters providing travel advice within Vietnam. The first letter recommends visiting Hanoi, describing its cultural beauty and good weather in autumn, as well as famous local foods. The second letter suggests visiting different landscapes in northern, central, and southern Vietnam over one month. It recommends Co To island, Ba Na hills in Da Nang, and HCMC for food. The third letter provides more specific advice, recommending Sapa for mountains and ethnic groups, Ha Long Bay as a natural wonder, and experiencing Hanoi's old quarter and traditional dishes. The fourth letter wishes the recipient a wonderful trip in Vietnam and looks forward to hearing about their travels. It highlights beaches