That's my biggest problem with bike commuting, I don't walk anymore. I can leave it just in front of stores, there is a bike rack just next to my office entrance, etc... I walked a lot more when I was car commuting
For shorter distances I will always choose to skate, it is much more convenient as I don't have to deal with locks and helmets and specialist shoes etc and isn't much slower unless there are significant uphills.
Good bit of cross training too pushing a skateboard instead of pedalling xD