What restaraunt?

Thanks to the suggestion of someone the other day, we are sending my parents to a Christmas show downtown in December as a thank you gift.  We had budgeted a certain amount for this gift, and I have $50 left over after buying the show tickets.  I would like to get them a gift cert to go out to dinner with the remainder.  Where would you suggest that wouldn't cost them an additional arm and leg (past the $50) to go out to a good dinner?