Bigs5068's advice was very sound. (Almost) never turn down an interview - it's always a good opportunity to practice. Plus, you never know that you won't get there, see the town, the firm, meet the people, and realize it's a perfect fit for you. Either way, it's a win-win. If you hate it, you've gained interview practice that will allow you to perform even better next time you get called into a firm.