Cambodia, Malaysia and Thailand

I want to take a trip from Shanghai lasting about 10 or 12 days to some combination of Cambodia, Malaysia and/or Thailand. It seems the best connections from Shanghai are to Singapore or Bangkok and then it is a easy flight to any of the other locations. Any one have suggestions or thoughts?

I have been to Cambodia many times so here is some useful information. Cambodia is the successor state to the mighty Khmer empire, which, during the Angkor period, ruled much of what is now Laos, Thailand and Vietnam. The remains of this empire can be seen at the fabled temples of Angkor, monuments unrivalled in scale and grandeur in Southeast Asia. The south coast is fringed by tropical islands, with barely a beach hut in sight. The next Ko Samui or Gili Trawangan awaits discovery and, for now, visitors can play Robinson Crusoe. Inland from the coast lie the Cardamom Mountains, part of a vast tropical wilderness that provides a home to elusive wildlife and is the gateway to emerging ecotourism adventures.