If you want to meet people from all over the world, you should check out Smokey's coffeeshop on the famous 'Rembrandtsplein'.
I have never been inside this place, because there are only tourists allowed inside. So make sure to bring you ID to prove that you are a foreigner!
Dress Code: Nobody cares....
Smokeys close to The Milkey Way nightclub is great for a game of pool a chill out and beer all around this area are clubs, bars and the like (not seedy) A club will be great one night bad another so its good to dip in and out earlier in the evening say 7.30-8pm and see what you like while it is free or happy hour. Some clubs do free drinks for the girls on Sundays and Mondays although this too changes.
Unless you are a boy stay away from Aprils Exit - its a nice gay club and the music is great but they are not very friendly to straight girls in fact down right hostile.
Dress Code: Smart casual for most places would be fine.
If you are in jeans and trainers it will only slightly limit you.
Street walking : my advice is never pick a spot and stay in it .. well SMOKEY was my favourite stop , but only for W.C. and stuff ..
The guys in SMOKEY r cool , and honest , and always RED EYED .. Smileing .. have a smoke infront of Cent. Station , and take a river cruise , what can i say ' u feel u been just born'
Dress Code: i saw some folks jumping into a canal wearing swimming suits by 8:00pm shouting :' FREEDOM ' .. Dress code heehehe