Only a really old friend can say this to you.  We are talking brutal truth.  (That's from a movie, right?)  Anyway, I can't help you with packing, but I do have very important advice.  Eat lots and drink wine!  You'll burn the calories cycling.  You eat so Arizona-well and just forget all that!  White bread, white pasta, who cares???  It's Italy for Christ's sake!!!  Oh, and I've never been to Europe b/c I'm a loser, but the word on the street is that sneakers make you look like an American.  ha.