The Crown Bar is a great place to visit and have a drink. The food we had was worse than awful! Maybe it was just the day but I would never recommend eating there.
I'll e-mail the oldest who live in NI and see what he recommends. He fancies himself a bit of a foodie. Do the double decker tourist bus. It was really good especially since we had a catholic giving the narration and took the protestant mother-in-law. Best fun we had all year!