Fansipan is Vietnam’s tallest mountain and more than a few tackle its summit. Most agents offer two and three day treks although if you took a private tour you could spread it out.
Accommodation is in tents or bamboo huts at just over 2,200 metres. At 3,143 metres, it is below the lie of winter snows but it will get cold enough. Most groups require at least two passengers and charge US$60+ per person.