I would never send anyone to a nation wide chain. But there are NY Touristy restaurants, which are good, but not everyone likes those kind and is only looking for little places. Great sushi, great italian, great ANYTHING can be found...and all pretty easily.
NY has great museums: my favorites are The Guggenheim (depending on the exhibit) and Museum of Modern Art.
If this is your first time, I'd suggest one of the Greyline tours...either by boat or bus. Some are on and off and others are not. A great way to get a taste of the whole city.
You should definitely spend an afternoon in Central Park. Grab a blanket and a lunch and relax.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.