h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

It has been said before by Lock Shock & Barrell, but it needs to be repeated: Bring an extra pair of shoes with you. Nice if the pair of shoes you're currently wearing are killing you, and a must if the first pair got wet, too worn out, eaten by a dog or are otherwise no more in best shape. See to it that every pair of shoes you've taken with you is comfortably worn in, so that the spare ones aren't killing you if you have to rely on them. Blood blisters are not as nice as its name says, especially on a trecking tour in wilderness since no one will walk by and bring you some slippers.