One of the biggest daymarkets in Amsterdam is the "Albert Cuyp market". You can look for everything from vegetables untill clothes and everything between. Behind the market stalls are little specialized shops with all kind of stuff. We have lived here nearby in the neighbourhood for seven years and on my way to work I passed the market daily. I still enjoy a walk so now and then over the "Cuyp" as Amsterdam people say.
You can buy many flowers for a reasonable price.
I love to stroll around in the antique shops.
Mostly it is very crowded here, but sometimes you wonder where is everybody?