Traveling to Siem Reap from Da nang

Hi everyone,

My husband and I are traveling from Bangkok to Hanoi, Da Nang, and Siem Reap, then back to Bangkok. I've finished my research for Vietnam, and now I'm working on a 2-day itinerary for Siem Reap.

I have a few questions:

1.What documents do we need to prepare before arriving in Siem Reap? (I am Asian and my husband is South African)

2.What airline best to fly from Siem Reap to Bkk?

3.What hotels do you recommend?

4.Besides Angkor Wat, what are the best places to spend two days in Siem Reap?

Sorry for the many questions, and thank you for your help!