When in Amsterdam, having a strategy is important, as its top attractions today require advance tickets. Don't plan ahead and you likely won't get into the Anne Frank House or the Van Gogh museum. But don't plan every moment. You want to leave some time for serendipity to work its magic.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.