Las Vegas. I know it isn't a typical case but it is definitely pedestrian unfriendly and largely if not entirely developed post-car.

Edit: Even along the strip itself it is hard to take a direct line and you need to go over bridges etc. Walking from the main part of the strip e.g. Bellagio to the convention centre is only a couple of miles but is a pretty unpleasant walk. Whether it is better than waiting for a bus/taxi from CES probably depends on the condition of your feet and the shoes you are wearing.

I do understand that in the Summer it would be a pretty unappealing walking any distance at all.