I'm interested in heading to Vietnam after the tour. I would be down to check out Ho Chi Mihn and Hanoi. I think I would like to see Hoi An in between. I would need to fly out of Hanoi on Thursday Oct 4th. That would be about 2 days in each city. How were you planning on getting from Siem Reap to Ho Chi Mihn? I found a flight for $225 and a bus for $22 (but the bus takes all day).