six weeks in asia, where should i go?

Hey guys. i%26#39;m only allowed six weeks off work and so have booked flights into singapore and then will depart from bangkok. Where should i go and how should i get there? (Realistically as i know i won%26#39;t be able to do everything!!!) Having trouble prioritising and planning most cost effective routes!

Many thanks for your expertise!!!!

six weeks in asia, where should i go?

Six weeks .... how nice :-)

If it was me (full of envy) I would get the night train from Singapore to KL (rather than fly on to BKK) and then AirAsia to Ha Noi and work my way north to south in Vietnam (trains and buses) before heading up the Mekong from HCMC to Cambodia (using Sinh Cafe). A few days in Siam Reap and then back to Phnom Penh to fly AirAsia again to Bangkok and take a night train to the north and then back to the south for some civilized beach time .....

Singapore and Kl are very gentle introductions to Asia and Vietnam is interesting enough although I much prefer Cambodia and Thailand.