Your inquiry is fairly common. Have you searched the Board at all? Here is one recent thread on the subject, which is by no means exhaustive: http://chowhound.chow.com/topics/887263
It would help if you assist us in focusing a bit: Are their particular locales -- e.g., close to any specific tourist attractions -- for which you'd like restaurant recommendations? What type of price point do you have in mind? Are local specialties like deepdish pizza or Italian beef of interest? Particular ethnic foods that you would like to sample or avoid?