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This is so cool.
I just returned from doing the 4 rivers and really enjoyed it. Impressive level of infrastructure, not high on the adventure scales but great fun and pretty beautiful (particularly in the middle of the country). Possibly the easiest place i've ever travelled with no local language.
Speaking of adventure, I lived in central Vietnam for about 18mths. If you want an amazing ride, albeit fairly remote and challenging, there is the Ho Chi Minh Highway that run parallel to the Laos border (https://goo.gl/maps/miYn6F9S2tu). For a country and densely populated as Vietnam it is surprisingly quiet and idyllic. The scenery tho....
getting ready for China