Busy and dirty! We did an independent walking tour of Amsterdam, including touring the Anne Frank House. Consider purchasing tickets to this online, where you can specify an entrance time, otherwise you may be waiting in an hours-long line.
Quaint and beautiful! We did a ships sponsored walking tour of Brugge. Do not miss this lovely, ancient town, just for the sights alone! We concluded our walk with a beer-tasting at a local pub and are glad we did not miss this. We tasted 4 full servings of local beers in a short timeframe and were quite well on our way before we even left the pub!
Least favorite port and overpaid for a ships sponsored tour to go see a dinky palace in Sintra, stopping at a smelly beach town along the way. Take a Lisbon tour instead!