dods is right. in texas at least. lol. it is illegal to park a bike anywhere a car can't be legally parked. but bikes will get away with parking some places cars can't, unless the cop's a douche. use common sense. don't take handicapped spaces, or park in a striped zone that someone handicapped might need to get out of their car. if a sidewalk is wide enough, like at walmart, and you can get your bike out of the way, go for it. personally, i wouldn't want a ton of people walking by my bike on a narrow or well-traveled sidewalk.
Yesterday is but a dream, tomorrow but a vision. But today well lived makes every yesterday a dream of happiness, and every tomorrow a vision of hope. Look well, therefore, to this day. -- Sanskrit proverb