Just chuck it in the hedge like everyone else does, that or a nearby river or stream, if those can't be found just save them up until you have a nice big sack and find a nice glade or unspoilt piece of woodland and chuck them there, along with any old fridges or furniture and glass bottles that you don't want, preferably smash the glass first.
As for cans,no point in burying them, many are made of aluminium, it won't rust. Rabbits foxes and badgers can dig that far down, and could dig them up, as often happens
I think the point has been made enough here. Take it home and dispose of it properly. leave nothing behind except a smile and good memories