Anything is walkable. I wouldn't want to party up in town and have to walk it. Of course, if you were over-served at one of the many great places, you could get a taxi to the bridge and walk from there. Maybe 5 minutes from bridge. If you are going to have lots of back and forth, as well as, buying your own groceries I would want a cart or stay closer to town.
In Aug. we stayed between "downtown" and the bridge. It was great. Close enough to walk in for breakfast before diving or to do a bar crawl South and back.
Walking is great, but let's face it, it's vacation and no one wants to be hauling stuff around or spending more time walking to places than enjoying the views and the relaxation. JMHO