What a perfect username for this topic.
I really can't remember names
but the Grasshopper or the Bulldog are the touristy places where they sell you pre-rolled stuff in addition to selling by the gram. But there will be a ton of other places walking distance of Centraal Station on the opposite side of the Red Light District. Speaking of which, go there and have a look. It's interesting but I'll never go there and err, be a customer.
Leidseplein (sp?) is a cool place to hang out in. Decent bars and clubs although be aware of a few gay clubs there. They managed to drag me into one of those and only an hour later I was informed it was a gay bar. The giant penis on the sign should have been a dead giveaway but I wasn't functioning normally.
There's other great things to do there like the Musuem's, Canal trips, Visit to Cheese and Wooden Shoe factories, Tulips, Cycle tours etc. but if trying the local weed is your thing then - Silver Shiva, White Widow, ___ Bubblegum (forgot the name) are decent. Stake out a nice place to eat though. There's New York Pizza chains everywhere. 3 Euros a slice. Then there's a KFC by Dam Square and a Burger Joint right by KFC owned by a Pakistani man. Say Hi to him from me, always gives me a free burger..
The hotdog stalls right opposite the station aren't too bad either.
PS - Do try the 'Space Cake' followed by a visit to Infinity - The hottest club in the Dam.
Good Luck.