ms.weirdwell

We are a family of 4 going on our first ever cruise. We will be joining my parents. Do we have to book all of our excursions in advance? What happens if the weather is awful or one of us gets sick the day of the excursion - are we able to cancel or switch the credit to another excursion? Or can we book some of them once we're on the boat? Will different excursions get added as we get closer to the sail date? We're going to Alaska in early June and I'm anticipating lots of cold, wet weather.