We are going to be on the N. European cruise in 2018 too! I contacted the confectionery shop directly and I can book a class with them without having to go through Disney. We were going to wander through Tallinn on our own and some of our party wanted to tour the KGB museum and others were going to do this class. I'm going to try to book it for around 2 pm so we have plenty of time for the class and to head back to the ship. That adventure with the reindeer sounds great! I had thought about just touring Helsinki on our own, but I bet our kids would love that excursion too. And it looks like you still have a little time to walk around Helsinki town center