My wife and I (from the U.S.) are going on vacation and as part of a larger itinerary have scheduled a week in Northern Ireland, based in Belfast. We'll spend the first couple of days decompressing and exploring the city, but besides that I'm wondering what would be worth doing there during that time. I've been focusing on the other parts of our itinerary and have only very limited knowledge of that area and its attractions. We plan on renting a car for a day or two to get out of the city but otherwise will be relying on public transit. Thanks in advance for any recommendations or advice!