Thanks guys. BTW, does adding Angkor Wat to a "mainstream" Thailand trip require more drugs? I think I'm going to have to subject the family to the anti-malarial meds for an upcoming trip to southern Africa, so I'd rather not do it to them again (unless we need it for Thailand, anyway).

It sounds like flying is way more efficient than land transport. It also sounds like there are some tricks to get tickets cheap. Since I'll need 5, I'd appreciate any advice on how to minimize the cost (like which program is GotBucks?).

I'm hoping to fly home from Siam Reap with a stopover in China using a Star Alliance award.