Speaking as both a gurl and as an owner of both Doc Martens and Alt-Bergs, I've got to tell you - stay away from the DMs for proper (i.e. off road) walking.
I own several pairs of DMs for gadding about in the city (I'm a native Londoner) and I'd no more think about wearing them in the bush as I would do a pair of Converse. They're totally unsuited for the job - even the ones that *look* like clompy army boots.
I'm currently 'breaking in' a pair of these Alt-Bergs Warrior Boots:
(
From Silvermans)
They're current issue and I say 'breaking in' because they are comfortable from day one; Army issue footwear that's designed to be drawn from the stores and hit the ground with no further work - bloody brilliant. Alt-berg do a female-specific boot, as well - no messing about with boots made on lasts designed around blokes with small feet.
If you're going somewhere warmer, they do desert boots, jungle boots and 'sneeker' boots which are lighter and possibly more suited to where you're going.
Although I bought mine in London, I considered a trip to the factory shop for a custom fitting, but fortunately I seem to be the person who British Army boots were designed for, so I'm good with a 'medium' fit for my size.
Anyway -
check them out, they're British and I don't think you can buy better.