I've heard people say they don't think gift certificates are a good gift, but I would LOVE to get one to a bookstore, museum gift shop or art supply store. No one has ever given me one though. The reason I'd like one is that I rarely give myself permission to buy anything from those types of stores even though I love books, etc.
Also, I'd love to be able to give gift certificates to those types of stores! But I don't know anyone who really shares my passion for reading or art.