Avoid the Tourist traps
Read the reviews here ::
http://www.coffeeshop.freeuk.com/ACDfrmGu.html
They have a Map too
Go to the Grey Area 1st (my suggestion) as they have quality weed. Try some AK-47 to start :)
Make a Map (before you go, stoner..) and mark all the coffeeshops on it you want to visit. After reading the reviews :)
When you get to your first coffeeshop - ask them for the coffeeshop map, they will know what you mean - its a nice fold out map with loads of coffeeshops on it, it will back up your own map.
Places like the Grey Area let you really take a good look at the weed and smell it etc. So go ahead - make the most of your trip in every way possible.
Stay cool.
Prices:
Grey Area (Yeah I know - enough already lol)
Prices in Euros:
Ak-47 1g 7.50
Sour Deisel 1g 12.50
Crystals 1g 15.00
Buy the crystals if they have them - OMG
Go see the guy at the "Dutch Flowers" for Hash - he has tons of types, just tell him what you like. He's a big guy with a bald head and looks Fuck-Hard but he's a nice guy. My mate knocked a table over (plus drinks) and he laughed it off saying "It's a bar, shit happens" - You can buy beer there - very rare. I chose some hash and he said "no, try this one" as it would be smoother. He let me buy .5 gram deals so I got to try 4 different sorts of hash while I was in his shop - he was right on the money with each one. This guy was cool+1.
Sorry rant... stoned