Find what's hot find what's just opened and then look for the worst review of the week. There is so much to learn from watching a restaurant getting absolutely panned and having a bad experience. Go and see it for yourself.
I get a lot of the ideas when I'm resting - either when I'm meditating or getting some kind of work done on my back like physical therapy or acupuncture. That's where I get my best ideas maybe because I'm balancing my body.