I'm flying into Ho Chi Minh on 24th July 2014, and I fly out of Hanoi on 5th Aug and am looking for a travel companion to cycle with me for most/part of the journey. I am thinking of taking a couple of train trips along the way, so maybe cycling for around 6-7 days in total roughly. Ive done a little cycling before, but not on this scale. I'm in my late 30s and am quite fit, but I'm not taking this too seriously. I'm hoping it'll be a fun/active holiday.
Any tips for doing this trip? Route to take, cities to stop in. Roads to avoid/take? I hear SH1 is very busy.