I think that if you dont know anyone there, or aren't familiar with the area, a tour may be cool. But maybe try one of the walking tours, you'll see more. MM can you help here? What about the walking/tapas tours?! :p yummy!
As far as restaurants... well, right around there you don't have too much 'typical' spanish...Hard Rock Cafe, Haagen Daz...and if you head towards the Plaza Santa Barbara you have some Am. style rib place, and a hollywood on the other side of the street. However, once you pass these places, you'll start to find more spanish restaurants and stuff of the like.
At Santiago Bernabeu, there's a TGIFridays... what kind of food are you looking for? Spanish or American?