The picturesque valleys of Sapa are perfect for trekking. The most popular trek takes up to two days which tourists can prelude with a visit to the Cat Cat village. Scaling Fansipan Mountain is an excellent option for those looking for a challenging trek. March-April is ideal for trekking when the weather is refreshing, and the treks are easily navigable. Most guided tours start from the city centre, so it’s better to opt for a night-stay nearby.