The only place where you can stroll alongside the River Zaan is to be found in the small town of Wormerveer. Within easy reach of the overcrowded Amsterdam City Centre (just a short twenty minute traintrip away) you will find a charming spot to relax.
A good start to see the surroundings is to visit Pasman's bookstore at Zaanweg 100. There you can find all sorts of maps for biking and hiking in the local area. Industrial heritage (19th century), windmills (Zaanse Schans) and plenty of rest are among the many things to enjoy.