what do you do? carry an extra pair of shoes in a back pack?

i need to go to the hardware store. i would normally drive, but i'm trying to make more of an effort to bike when i can. it's just a few miles down the road. nothing i can't handle.

my bike has clip pedals. they don't work very well with street shoes. my bike shoes are hard, noisy and hard to walk in. i about busted my arse one time at "the other place" pizza pub on their tile floor. it would take me longer to change shoes at the store then change back into bike shoes than it would to just go in and do my business. i don't really want to take the time to put the regular pedals back on the bike.

thoughts?