[Leica] Planning a trip (with Leicas)

[photo.forrest at earthlink.net (Phil Forrest)]

I'm planning a multi-month trip to SE Asia after I graduate when the
fall semester ends. I'm hoping to take at least my M9 and preferably my
M8 as well. I'm thinking that most of the trip will be spent in Vietnam
and Cambodia.
Aside from the usual issues of traveling with regard to security of
gear and whatnot, are there any things I should be aware of as a
tourist with a camera? Specific laws or regulations come to mind. I
can't really find any information about this and most folks say I'll be
fine. 
I'd love to hear from the LUG'ers who've traveled there and have
any experience and advice they could pass on from the point of view of
a photographer.

Thanks all,
Phil Forrest