One of the things we planned to do, and which we eventually managed with great pleasure, was a hike up Mount Fansipan (Phan Xi Păng), the highest peak in Vietnam, and indeed the "roof of Indochina". It is, admittedly, only 3,143 meters high, but for me even that is quite a lot — I hadn't been to the mountains before. This hike was intended as a trekking route, meaning it requires no special mountaineering gear, except maybe trekking poles. Fansipan doesn't have an alpine difficulty rating, so it was just right for my first time.
We walked 20 km according to the GPS, with an elevation gain of 1,843 meters. My GPS measures altitude inaccurately, but it's safe to say we started from about 1,943 meters and made it to 3,143, meaning the difference is 1,200 meters. At the same time, the trail had plenty of alternating ascents and descents. And don't forget the way back!