If you like to get out of the city on a hot day, go to the Uitdammerdijk with your bike. You first take the ferry behind central station, then cycle over the nieuwendammerdijk next the Dutch folklore dike houses in direction of Durgerdam. It will lead you over a long road next do the dike and water. Pick your spot and jump in the water! Somewhere on this route is a pylon in the water, where all the brave boys can show their stale man-nerves and jump off. Just take a towels, drinks, a book, some snacks and you can have very relaxing day outside of the hustle and bustle of the city. It's a 20 min bike ride from the city.
Uitdammerdijk, Amsterdam, Nederland