Of course you can buy all the typical tourist things on this little island, but maybe a bit more original and very local would be this little bottle of local drink called "Juttertje". It isn't from this island itself, but comes from one of the neighbouring islands "Texel". It's a bottle of "kruidenbitter"; a sort of herbal alcoholic beverage. There are many of these types of herbal liquors in The Netherlands, but this one is traditionally from the islands. Drink it cold and in a small glass, excellent for warming up after a long walk on the beach on a cold windy day.
From the outside it looks quite a normal house but when you get closer you can see only half of the house is lived in, the other half is stuffed with books.
I could have spent hours here!