Totally bored and looking for a home-based suggestion and come across this older thread to respond.
I think the worries are most from when you are walking out spa, or down the stairs from a building. Whoever you bump into, they know exactly where you are coming out from.
I am less worried about people seeing my car within the vicinity, but extra caution never hurts, so park a good distance away. I don't any decorative stuff in or on my car that can be easily identifiable. My car is dime in a dozen, and unless someone memorize the plate, they won't know.
When you enter, you always check out your surrounding before entering. If you bump into a friend at the destination, there is nothing to worry about and you just know someone has the same taste and needs as you.
If you worry too much, you should just quit. There is nothing you can do to avoid if the invisible hands are working against you... Even you are 100, 500 or 1000km away from your own neighbourhood.