Not a big fan of zoos and animals behind cages, but if you can spot Flamingos in the east-centre of Amsterdam, then count me in <3 ! You can actually see them while riding the bike on Plantage Middenlaan, quite a beautiful scene.
Note: De Plantage next to zoo is quite cool cafe/restaurant, with a mix of vintage style and industrial elements of the old buildings of Artis. Great atmosphere, and ideal for a more sophisticated outing.
The city's biggest flea market is hosted the first weekend of each month in and around a gigantic warehouse in the industrial area of NDSM in Amsterdam Noord. I love to snuff around the hundreds of stalls to find unusual props. Taking the boat to cross the IJ and leaving the old centre behind is very refreshing. Make sure to also have a drink in Noorderlicht while the sun sets.
Ex theatre, ex d.i.y squat exhibition space, the W139 has now evolved into an official playground for contemporary art. Most works are made site specifically and are not for sale. This creates an exciting platform for experimentation. This gigantic space; absurd oasis in the middle of the invasion of sex toys, plastic pizzas & weed souvenirs of the Red Light District, is a must see. The openings are legendary and gather all the art kids in town. I use to work here as a host, as a barman, and I even designed their invitations from 2007 to 2008. All of my friends work or exhibited here, and it's one of my regular stops when biking around.