Hi,

I'm traveling through Cambodia when I do my SE Asia trip in Jan.

I've done some slight research and it seems that must go tourist places are Angkor Wat (just out of the city Siem Reap), and the Killing Fields (out of the capital city Phnom Penh to the south of Siem Reap).

There's also a massive lake in between these two cities which I'm thinking of ferrying across.