Had a flying visit to Belfast from Sat 12pm - Mon 3pm, up from Dublin. Drove with wife, one 6 year old, and one 2 year old.
Went straight to W5 in Odyssey, arriving @ 12pm. Great place for the kids and adults. Very entertaining. Not too packed, just right. Lots of hands on entertainment, interactive. Went to Pizza Hut between 5-6.30pm in Odyssey. Far better then any of the Pizza Hut's in the Republic. The Odyssey was a really great spot with plenty of places to eat etc.
We were staying in Dunadry Country Inn, about 20 mins from Belfast (see seperate review). Called into Toys R Us en-route (don't have these down south). Picked up a couple of decent things, including some Xmas presents on behalf of others. Bikes are also very good value.
Next morning Sunday, clocks went back, but no one told our children! Hence, well up by 8am, and out by 9am. Went into Antrim, which was completely closed, and did not look up to much. We were going to go for a walk, but due to rain, we said we'd head into Belfast city centre. Stayed around there till about 11.30pm, but everything was closed. Due to rain, very limited options, hence headed back to hotel for a swim.
Went to Junction One Outlet Mall in Antrim (10 mins from hotel). It's like a smaller version of the one in Chester, UK. Some good shops like M&S Outlet, Speedo shop etc. Good outdoor (but covered) kidies play area - very new. The Reebok, Nike and Adidas were good if you were a very sporty family, short on gear. Polo Ralph Lauren shop was very expensive for an outlet mall. While I was not expecting value like you get in the US, shoppers did not seem to be buying much in this shop. Any bargains were in odd sizes. Had dinner in Rain City=very good for kids. Nicest chips I've eaten in years (and with very fat!).
Monday - went into Belfast city centre. Wanted to be close to city hall, parking = GBP2.50 per hour. Went into WH Smith (a bit of a dissapointment), over to Disney store and Gap (again both small). Left soon after.
Hope this helps!!!