Personally Peter, I wouldn't bother. But, if you're up for it, then check out the 'Look Useful Information' thread, there's a map of the circuit and surrounding area, and you should be able to navigate yourself there using it. The restaurants (and I stand to be corrected here) are the small outcrop of buildings shown just before the second chicane.
To be honest, I've put it down on second hand reports. I went there when there was just an armco between you and the cars, and it was absolutely stunning. A few years later I went back when the screen was up, and stayed about five minutes. I've never eaten there, but as I say, I don't really see the point these days.
Take a sandwich to Arnage.
H