Depends what sort of travelling, white water rafting, and climbing mountains is different to a couriered coach tour. When you consider the cost of perhaps having to return to shoot on a better camera as opposed to to cost of it, that might put it into perspective, cameras can be replaced opportunities can't always.
I'm going on a trip to the WW1 trenches and that's by coach, but will probably take my old 350D, more for convenience and it will probably be sufficient for what I want, rather than the heavier 7D