Cambodia is on every Southeast Asia backpacker’s list of places to visit and for good reason.  There are a ton of other backpackers, but you can’t miss it.  At the very least, you have to visit Krong Siem Reap to see Angkor Wat.  We also stopped over in Phnom Penh.  I highly suggest that you don’t take any overnight buses while you are in Cambodia.  They are known for crashing, and one of our friends was involved in one of the crashes.  The bus driver died during the crash, and it was traumatizing (obviously) for her.  Just don’t do it.

This is where the backpackers flock to.  Angkor Wat and all the other temples!  Look at our photos from Cambodia here to see photos of each of the temples we visited in Krong Siem Reap.  We went to Angkor Wat (duh), Bayon Temple, Ta Prohm (the Lara Croft / Tomb Raider temple), Preah Khan Temple, Ta Keo, Neak Pean / Jayatataka (in the middle of a lake), Ta Som Temple, Eastern Mebon, Prae Roup Temple, and some other smaller ones that I don’t even remember.  There are so many, and they are everywhere.

I talk more about the Cambodian genocide in my overview post here, but Phnom Penh is really the place to go to learn about it.  There is also the Royal Palace to see, but it wasn’t too exciting.
 
We stayed at Eighty8 Backpackers, and there was a lot of partying with all the other backpackers.  It was really fun, and the pool was much needed in the heat.  They had beer pong too!!  They also have a sign-up sheet so you can find other people to split a tuk tuk with to go out to the Killing Fields and the Tuol Sleng Genocide Museum (S21).  I, personally, had seen enough about the genocide after the Killing Fields, but I think you may as well see both while you’re there.  It’s devastating stuff. 
 
See our photos from Cambodia here.