Vietnam forum

Hi Fiona,

Three weeks is a pretty short period of time to cover all three -- my advice would be to look into a fair bit of flying, allow roughly one week for Laos, ten days for Vietnam and the remainder in Cambodia -- primarily in Siem Reap .

So, you could do something like:
Arrive Hanoi, two nights, do a two night trip out to Ha Long Bay and also two nights in Sapa (each way by train).

Once back in Hanoi, fly to Luang Prabang in Laos, allow three nights there then overland to Vang Vieng and Vientiane -- allowing four nights between the two of them.

Then fly from Vientiane to Siem Reap with three days there and then bus to Phnom Penh for a night.

Last leg would be boat from Phnom Penh to Chau Doc (in the Mekong Delta) and spend your last few days in Vietnam's Delta seeing floating markets etc, before finishing in Saigon for exit.

That is a LOT to try and do in three weeks -- but it is possible. Depends what sort of holiday you're looking for.

Hope that helps