Dec 31 - Jan 1st Transportation

I'll arrive in Siem Reap on Dec 27th, I'm planning to stay there for about 3 to 4 days, and then I would like to go to Phnom Penh. Are the buses from Siem Reap to Phnom Penh going to run on Dec 31st or Jan 1st?�@Also, is there another place you think I should see? I�fll be in Cambodia for about 10 days. I�fm not interested in beaches as I have sun allergies. Thank you.

Yes, they'll be running. Break your trip to Phnom Penh in Kampong Thom (see Sambor Prey Kuk) and Kampong Cham for a couple of nights.