An excellent interviewer is prepared. Read a book, have coffee, or sit in the park - activities like these are useful in easing the tension before interviews. Don't forget a subway map and cab fair.
Resumelance: After purchasing your favorite coffee beverage, go straight to the job and career book section. Read up on how to make the best impression, but remember, practice makes perfect.
Resumelance: If your stomach goes in knots before interviews, then don't eat anything with cheese until after your interview. I like the Shake Shack because it's in a park, but watch out for the diseased squirrel.