>>681290extra socks
water
multitool
2 lights
extra batteries
rudimentary first aid kit
snacks
more than one form of communication for the group (more than one phone, phone and radio, etc)
'tography equipment
liquorhol of choice
FRIENDS - never ever ever go alone
this is just what i generally lug along when i fuck around the train tracks and old mill nearby. if i'm doing something special i might bring special gear - like protective eyewear, latex gloves, etc. depends where you'll be mucking about.
DON'T bring any weapons. you'll go straight to jail for menacing or for being in the process of committing a crime, or disturbance of the peace, etc.