I'm in Siem Reap now. I've been temple tripping for a few days now. Angkor Wat and Bayon are pretty cool. I also saw the temple where Tomb Raider was filmed.
My favourite "Angkor" site was Kbal Spean, also known as "the river of thousand lingas". It is quite far from town (50KM) but well worth it. I went there on a bike (with driver) and trekked/climbed alone for 1.5KM (from parking lot) through thick forest. Since it is far from town and it's not peak season, almost nobody was there, so it was a bit scary as I have read about incidence of looting.
I ran into a couple of Swiss backpackers once I reached the river, so I had some company on the way back. They were on a four month vacation to Southeast Asia. The river itself is very cool with many carvings of Vishnu and Shivlingas. There's also a nice waterfall. I really enjoyed the site.
I'm going back to Phnom Penh tomorrow morning and then to Saigon (Ho Chi Minh City) on June 1st.
So far I love Cambodia. The people are very friendly and helpful. Everyone smiles. Cambodian girls come to me and tell me I'm handsome and that they like my smile! I think I should move here... hehehe