Want to adventure somewhere in Southeast Asia?

So I've got a couple unexpected free weeks, like late December, early January. I'll be in India in December and have to get to Australia by January 18.

Want to join me for some particular adventure in this part of the world that you've always been meaning to make?

Or, have you been somewhere around here and have ideas for what I should do?

(FWIW, the first thing that comes to mind is go to Angkor Wat and then up to northern Thailand and motorbike in Mae Hong Son. But I sorta did that a couple years ago, so I'm open to suggestions.)