Not the most inspiring of Cities. Walk up to the Castle (a fair trek) and there's a good view of the Harbour but the Cathedral had a Service going on so we didn't intrude.
Walked into town and, when we opened the doors to the Cathedral, found there was a Service going on (again!) so had a walk around the Old Town and then walked up to the Castle. As I said in 2004, a bit of a trek but exercise is good for you!