Southeast Asia forum

Hi,

We are in the process fo planning a five week journey through southeast asia and was hoping that you all could give us some input on our rough itinerary. I know we are being rather ambitious, but we are using Bangkok Airway's Discover Asia Pass to hopefully save some valuable time:

6/10-6/11 Hong Kong – 2 days
- Flight to Ko Samui, ferry to Ko Pha Ngan
6/12-6/15 Thai Islands – Ko Pha Ngan, Ko Tao – 2 days on each island
- Ferry to Ko Samui, flight to Bankok
6/16-6/18 Bangkok – 3 days
- Flight from Bangkok to Chang Mai
6/19-6/23 Chang Mai – 5 days
- Flight to Luang Prabang (Outside of Discover Asia Pass, Lao Air)
6/24-6/26 – Luang Prabang – 3 days
- 6 to 8 hour bus to Vang Vieng
6/27-6/28 – Vang Vieng – 2 days
- 3 to 4 hour bus to Vientiane,
6/29-6/30 – Vientiane – 2 days
- Flight e to Hanoi
6/31-7/2 – Hanoi/ Hanlong Bay – 3 days
- Flight to Danang (outside of Discover Asia Pass), 1 hour bus to Hoi An
7/3-7/4 – Hoi An – 2 days
- NOT SURE OF BEST ROUTE?
7/5-7/7 – Ho Chi Min – 3 days
- Mekong Express to Phenom Phen (leaves at 7am, gets in around 1pm)
7/8-7/10 – Phnom Pehn – 3 days
- Taxi or Mekong Express to Siem Reap (~4 hrs)
7/11-7/13 – Siem Reap, Angkor Wat – 3 days
- Flight to Hong Kong
7/14 – Hong Kong – 1 day

My questions are:
1) Is this a feasible itinerary and do you think there any of the places have too little/too much time (5 days is being given to Chiang Mai b/c we would like to do a trekking trip)?
2) Out of the three places in Laos, which one should I give 3 days to?
3) What is the best way to get from Hoi An to Ho Chi Min?

Thanks so much!