In addition to the other comments, lots of socks! If you get blisters, wear two thin rather than one thick pair. The double layer reduces the rubbing on your skin. The next day you can put a fresh pair on as the undersock and use the least dirty of the previous days socks as an outer.
Take you boots (covered footwear) off immediately you’re in camp, and put them on just before you go out. This maximises drying time and minimises the risk for foot infections. If you need some protection for your feet in camp, wear sandles and socks (the more open the better…or nothing at all if you have some semblance of civilisation at camp). That way your foot breaths in camp, but you still ahve some protection. Stay clean! Clean your feet. Clean your socks.
I got Cellulitis from too many cuts and abrasions and damp tropical conditions hiking for extended periods in boots. Keep an eye out for it.
http://en.wikipedia.org/wiki/Cellulitis
As a side note. Bring lots of baby powder and don’t bother with the expensive hiking clothes (cheap 100% cotton throw away business shirts and pants are great…can usually buy for next to nothing in markets in developing countries).
If you get irritations around your crotch or between your but cheeks…I did, but only after extensive hiking in extremely humid conditions…then before you set out put the powder around your crotch and between your but cheeks. Works great and stops the irritation. Wear cotton pants..cheap does it. I lived for two years in Bolivia, much of it in a tent in the lowlands, and hiked sometimes 30kms in a day. The baby powder and cheap 100% cotton pants and tops (which take the moisture away from the skin, unlike some of those expensive synthetic “hiking” pants) made it all possible, and cost nada.