Nothing to do in Amsterdam on a Monday morning? Go to the Noordermarkt! Whereas the rest of the city seems deserted, the Noordermarkt is a lively place. It is the last real flee market in Amsterdam, where you can find bric-a-brac, antique and second hand (and much older) clothing, shoos and more.
It is not a big market, so you might want to go around the corner to the Lapjesmarkt (fabrics market) on the Westerstraat. At this market you will find lots of fabrics, but also new clothing, fruits and veggies, etc.
Behind the market stalls are some nice shops and some great café’s and coffee houses where you can have a good cup of coffee with the famous Dutch apple pie.