Hi, In 2018, we did the Geirangerfjord panoramic bus mentioned by Dani above. There was plenty of time to fit this in for the Princess cruise we were booked on. It was really good.
Last year we went to Kristiansand, we didn't do any excursions just walked into town from the port (about 30 minutes walk, but we are slow). It wasn't that exciting a port so an excursion might be a good option.
Hope you have fun.