Lush is an excellent store to stop by in SF. If you are a visitor staying at a hotel go nuts and pick up bath bombs and bubble bath and use it in your hotel bath tub. Let them worry about washing the tub and towels when you leave. If you are a local you will become an addict a.k.a "Lushee." The staff is quite friendly and the products prove to be the most inexpensive luxurious bath products next to a trip to a day spa!
Pros: the fresh smell, easy transit, the location
Cons: habit forming
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