What's the best way to travel between Vietnam, Cambodia and Thailand?

arrives to SG, VN to stay for a few days, then take the 6hrs. bus ride to Phnom Penh. stay there as long as you like, then take a tour bus to North heading to Angkor Wat and stay there a few days. heading to Thailand via bus or fly is all depends on you...it very close by already. good luck and have a save trip. in Thailand there are still a lots of political problems there...most of my colleagues teaches English there went to Seoul, Korea and Japan.