Don't do it. You are way way too long on the bus and hardly get any time in the cities.
By all means go to see the places but do it by train and make it at least an overnight trip.
Well, some info is down in this
Generally cannot understand why someone would want to do this with a group; DIY is more flexible, almost as easy, and 2 x 1 hour faster as the Thalys train beats the road traffic speed in a large way!
All the best,
<Erik> & [Sandya]
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