Amsterdam is beautiful. Once the seat of power in the world Amsterdam has something for everyone. In winter it is cold but beautiful. Take a stroll down any canal and actively look at the build date for each building you see. The cities hayday was in the 1500's and many buildings you see are dated from then. They have shifted and have a very distinct wonky look about them. From the centuries of shifting city foundation.
Another big draw in Amsterdam are the coffee shops and strip shows. You will get lost in the haze of the fun. You will see people of all types and locations branching out to try new things. Just remember to keep your wits about you in a foregin land.
Activities:
See the wonky old buildings
Coffee Shops - I very much enjoyed Abraxas but also I went about and tried as many clubs as I could. There are so many to try! I recommend getting lost and finding cool holes in the wall like abaxas and the foundry.
Stroopwaffles - AMAZING SNACK.
French Fries - the best fries you will ever have come in a blue cone and can be found on the main strip.
Bicycles - DANGER - amsterdamn is a bicycle city. They seem to have the right of way everywhere so make sure to stay vigilant and out of their way
If you are feeling adventureous checkout the lighted windows or kink shows.
Helpful commentary on these cities!