Hi Kiwis. We took that tour in October 2015 and it was marvelous. We stayed in Amsterdam for a week and Haarlem for two days before the tour began.
Depending on how much time you have prior to tour and your interests, you might consider a museumkaart if you are interested in seeing great art. It takes about 5 visits before the card pays for itself. We not only toured art museums but restored canal houses of some famous locals and they are marvelous: Willet-Hothuysen and Museum Van Loon are my two favorites. The Verzetsmuseum (Dutch resistance), Rembrandt huis, Van Gogh, and a few others were some of the highlights of our trip. We spent time walking the city and drinking wine by the canals. We took a city walking tour with ThatDamGuide the day after arrival. You could also do a janever tasting at Wynand and Fockink or a cheese tasting at Reypenaer's- fun.
In Haarlem we toured the Corrie Ten Boom Huis, Teyler's museum, the local archaeology museum, the Saturday market in town square, and enjoyed walking about town. Check out Bij Babette for some lovely sandwiches and homemade desserts.
There is so much you could do in Paris after the tour ends: More Louvre, Eiffel tower, Rodin museum and gardens, a visit to Versailles, Montmarte and Sacre Couer, Orsay museum, relaxing and people watching while you have wine or coffee at cafes, shopping, the list just doesn't stop.
Have a splendid time on your tour!