If you are so uncomfortable that you feel the need to "save face" as you walk, do what I do: pull out your water bottle and take a swig, then stroll along with the bottle in your hand... a fine "I meant to do that!"

Yeah, I'm just casually strolling along because I am admiring the view and I needed a drink, and my, don't you look sexy on that hot bike as you pass me! Have a nice day!

http://www.youtube.com/watch?v=vJXU7EVXs2A

(or haul out your cell phone, or a tube of Clif Blox... there are a gazillion ways to look casual if you are uncomfortable walking your bike!)