I wear a 13 EEEE, so I've always got skis on whether I'm in the boat or not.
For real, though: If it's cold, I wear boots and double up on socks because I'm a huge baby. If it's not cold, I'll just wear sneakers, or Merrell Hydro Mocs (which are like Crocs, but better, because they have a tiny bit more arch support and are always in sport mode).
My favorite mocs are matchy-matchy with my favorite jighead color.