For various reasons, we have a Celebrity credit to use and I was looking at a 8-night cruise out of Southampton, stopping in Nordfjordeid, Flam, Geiranger, Alesund, and Kristiansand. On this type of itinerary, is it more likely that we'll have to do excursions via Celebrity or will it be "easy" to tour on our own and/or with a smaller tour group?