Do you think adsense related to restaurant sites pay well? Whutcha think? If you say it does, I am gonna create like a biiiiiiiiiiiiiiiiiiiiiiigggggggg restaurant site!!!!
I can't imagine what kind of ads would display. It will probably for restaurant booking service, take away, etc.
I don't know about internationally, but in The Netherlands the market for restaurant and hotel-sites is pretty saturated. I don't think it's a niche just waiting to be conquered.
There are hundreds of restaurants database flying around on the internet and there are hundreds of those "biiiiiiiiiiiiggggggggg" sites.
ANY site you get to at least a 1000 visitors a day, and then start monetizing is going to help you learn about adsense (and other ways of making money). But it's wiser to start with a less crowded niche - getting those 1000 visitors a day is going to be hard anyhow. Don't make it harder on yourself by starting in a crowded space.
I'm not 100% sure if the Restaurant market is a huge earned via PPC ... I've been running a Bar Guide website for about 4 months now ... and just randomly put AdSense on every few days to test the waters ... I know this isn't the best way to test, but so far the earnings are below 4 cents per click it seems.
That's how it is with a saturated market. With good site-design and enough visitors that can still make you some money, but for someone just starting a new site - I'd recommend making something that has not been done before as often.