This is a must for visitors. I happen to love history, and these town walls are from the twelfth century! In boom times, these walls served a security purpose, but they also provided a means of collecting taxes - on the goods that passed through the wall. But the real reason to make it a priority are .... the views! The walls are high up on the hillside, and you can see why this was one of the great Irish ports going back centuries. You can see the harbor, and the river and the town from this vista point. The town itself is busy and lined with stores on both sides of Main Street, so you will have no idea of the grandeur unless you get up higher. There is parking above the walls, so make the climb in a car if you can. There are repairs going on - but be clever and you can find the parking lot. After the walls, head for the Heritage Visitor's Center on the harbor. Then walk through town from there.