For those traveling by train in Holland it is always worth checking out the local shops for excellent cheap day rail cards. They are usually over €50 but these cards available at stores such as 'Albert Heijn', 'Blokker' and 'Kruidvat' sell then at specific times of the year for €15 thats a cheap ticket for a full days worth of travel on the train. You can read more about this on my blog post here:
http://goo.gl/KTpAi1