Pack light and take advantage of the ships laundry as they do an excellent service and it's not all that expensive leaving you the ability to pack a lighter suitcase for traveling.
You are going to have a great time.
Make sure you get Anne Frank house tickets in advance.
Do the Amsterdam to Basel itinerary, book a hotel on your own and get over jet lag. Get to concierge 1st day to get tickets that you want booked if you did not get in advance. (And Frank House)
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