I just recently went over there on my bike and it looks as if there is plenty to explore. Check out the site below, it's in Dutch, but if you follow "Recreatie", then click on "Routes en bezienswaardigheden" (routes and things-to-see) . You will see some maps that may be of use. (Fietsroute = bike path).
http://www.noord.amsterdam.nl/smartsite.dws?id=1035
PS -- If you are a smoker of weed, take necessary supplies with you. I didn't see any coffeeshops on the two trips I made.