Don't make your decision about the camera...it's about the lens. Specifically the focal length -- which one is right for YOU and how YOU shoot.
No one can tell if it's a Leica or a Nikon, when they see your images. And a 50 is quite different than a 28!
Decide on the glass, not the body.
Congrats on the trip, it's an interesting place and the people are amazing.