thanks c_klein. Sapa is a definte as is climbing the mountain. Trying to work out a rough itinerary.
Hanoi, Sapa, Ha Long Bay, Tam Coc, Hue, Hoi An, DaNang(?), Nha Trang, Mui Ne, HCMC, Cu Chi Tunnels, Mekong Delta so far.
Gonna get the Rough Guide book today. Intend to travel north to south via trains and hire bikes everywhere else.
Did you book the Sapa trip with a tour operator?