Salut,
Pour avoir quelques idées d'itinéraires, avec les temps de transports, temps à passer à certains endroits, distance...
Tu peux jetter un oeil sur les suggestions de l'excellent: TRAVELFISH.ORG
D'un point de vue personnel, vouloir profiter de 3 pays différents en 20 jours... Cela semble plutôt irraisonnable. A moins de ne faire qu'une seule étape dans chacun de ces pays, et d'effectuer les transports en avion. Ce qui ne serait pas une si bonne idée.
All Asia itineraries Just some suggestions

CAMBODIA: One month adventure
If you want to really see much of what Cambodia has to offer, a month long exploration of the country will allow you ample time to see the most interesting destinations in the country.. ...
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CAMBODIA: One week explorer
Most first-time travellers to Cambodia opt for a trip like this - - the bulk of the time spent exploring Angkor Wat and a quick trip to the capital Phnom Penh.. ...
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CAMBODIA: Two week explorer
This two week trip gives the traveller to Cambodia a good mix of ruins, beaches and culture.. ...
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LAOS: Northern explorer -- head for the hills
This takes you through the popular tourist towns of Vang Vieng and Luang Prabang, but also gives you ample time to see some of lesser-visited Laos.. ...
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LAOS: Snapshot -- one week explorer
The trip that just about anyone who has been to Laos has done at one time or another.. ...
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LAOS: Southern explorer -- experience laid back southern Laos
Southern Laos sees far few backpackers and independent travellers than the north of the country, so if you're looking for less touristed destinations and a more "authentic" experience, then this trip could be for you.. ...
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THAILAND: A one-week holiday that will have you back for more
A trip like this is suitable for those who have just a week in Thailand but still want a bit of sun along with the culture.. ...
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THAILAND: Isaan explorer - get to know the northeast of Thailand
National parks, ancient Khmer ruins, lovely Mekong river vistas and the wonderful Isaan food -- we hope you like it spicey!. ...
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THAILAND: Isaan taster - just a sample of the northeast of Thailand
Not everyone has the luxury of a month to explore northeast Thailand, so here's a short trip you could cover in as little as a few days. You'll get to see national parks, Khmer ruins and finish off with some sleepy Mekong River scenery.. ...
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THAILAND: Jungle and islands - Islands and more islands
A trip to Thailand isn't complete without at least a little down time on the islands, and this 3-4 week holiday has plenty of island time.. ...
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THAILAND: Mountains and Islands - a two week sampler
Most first-time travellers to Thailand opt for a trip like this - - we certainly did. Striking north into the hills and then relaxing on the beach is, for many, the ultimate first-time Thai experience.. ...
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THAILAND: Northern explorer - two weeks in northern Thailand
You could spend six months in northern Thailand and not experience all it has to offer, but even with just two weeks you can still have a great experience.. ...
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THE REGION: Southern Laos, Southern Vietnam and Cambodia
For those set on getting an experience in Laos, Vietnam and Laos, but with only limited time, a trip like this is a good choice, as while you miss the north of both Laos and Vietnam, you save a lot of time that would otherwise be spent getting from A to B. ...
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THE REGION: Thailand, Laos, Cambodia, Vietnam explorer
This is the big one! Travelling throughout the region, you'll touch on the highlights of Cambodia, Laos, Thailand and Vietnam.. ...
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VIETNAM: Southern Explorer
This trip concentrates on the south of Vietnam, with a taste of Mekong Delta and beaches thrown in.. ...
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VIETNAM: Top to tail
Long and thin, Vietnam is well suited to a short trip like this -- just don't forget just how long it really is!. ...
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