We took a short trip to Cambodia visiting Phnom Penh (the capital city) and Siem Reap (famous for the Angkor Wat).
There are many ruins in Siem Reap besides Angkor Wat, such as Angkor Thom, Ta Prohm, Preah Khan, etc. The best time to visit is now, before the ruins are fixed too well.
Too bad we have not researched enough before the trip, thus wasted lots of time and missed few good places. Before you go, you should at least google search on places named above. I imagine the trip will be much more enjoyable if I have done that.
We should have arranged to have our guide to pick up 5am in the morning, back to hotel to rest mid-day, then out again 3pm for the best lights.
In Phnom Penh, our friend took us to a very good local restaurant that does not look too good from outside. The "Big Head Shrimp" was very good but not cheap at US$17/kg. So you need local guidance to good food. In Siem Reap, the only good restaurant we found was in our 5-star hotel (Raffles Grand Hotel D'Angkor). In small city like Siem Reap, I guess the market is too small for upscale food joint.
At the time of visit, our friend in Phnom Penh told us average factory workers earn about US$50/month, our guide told us people who can speak English earn about US$300 to $500/month. Since there is no guidance on tipping, we just gave US$50 to our guide & $20 to the driver in Siem Reap. They should be sufficiently happy for the 2.5-day work.
Just like lots of developing countries, US$ is THE currency on the street AND in government offices. I wonder why would any country willingly allow this to happen, as they lost control of the currency to the guys in Washington. Perhaps this is the price to pay to enter the global capitalism game. (In fact the same logic goes for IP address allocation, top-level domain name administration, etc... But that will be another long story.)