If you're in Sydney city hotel you would certainly find at least one restaurant and coffee shop in your area, but if you want to experience a whole lot more dinning opportunities, you can do so by exploring the area.
Along East Circular Quay you will find a series of restaurants near the wharves to the approach to Sydney Opera House. In the West Circular Quay, you will find numerous restaurants which include the Doyles at the International Overseas Passenger Terminal.
Another place you could search for when looking for a place to dine would be the Rocks district, you can find one of the distinguished restaurants for fine dinning which is the Rockpool on George St at the Rocks.
Darling Harbour, showcases restaurants that cater the western side. Chinatown serves one of the best Chinese food, you have to go to the southern end of the city to catch this. But aside from all those restaurants, you can still find a few just lining up the streets of Sydney, so take a walk around and you'll certainly find one restaurant that would suite your palate.