We were at Angkor last December. It was a sensational experience. And the prices there for both accommodations and private guides are quite reasonable. My recommendation would be to allow for at least three full days and enjoy the luxury of a private guide. There is lots to see and do. In addition to the ruins, you can book tours of both floating and land villages. We did both as we were there for five days. A totally memorable experience. Cambodia is pulling itself up by it's bootstraps and doing it in part with tourism. They get it. They do it well. And it is paying off for them. The people are WONDERFUL.