Hi dianeg, welcome to Cruise-Chat! Wish I could help you with your excursions, but have not had the pleasure of doing that itinerary...yet! Did you check out our Europe Port Chat section? It's a little further down on the main page. You can use your "find" feature, in the upper left hand corner, type in your ports and it will pull up all the posts made. You might be able to find something that interests you. There are plenty of members on this board that have been on your itinerary, so hopefully, they will see your post and can offer some suggestions.
You don't have long to go now, I'm sure you're getting excited. I know I would be!! Hope you have a marvelous cruise and enjoy Celebrity. Best wishes!