How about WALKING 30+ miles from where i live to Meir (near Stoke-on-Trent) with only a waterbottle and no food all day? Plus i ended up walking further than that because i kept getting lost on the way due to a certain friend of mine who kept getting us lost. So in the end we ended up walking like 40+ miles due to his incompetency!
Oh well it was heaven when we finally got to our destination after braving multiple LONG stretches of motorway...I've never been so glad to rest my feet, have some crisps and drink some cola in all my life!