Man of experience has arrived. If I was you I'd go to the Grasshopper coffee shop just off the Damrak, the main road from the central train station to the main city centre. Its very touristy but also very safe. In the basement is the coffee shop, there are menus for which drug you want to smoke from Lebanese to Thai. Also brownies and whities. I would just buy one joint, already made up for you. Thai is very mellow and a happy high. Skunk blows your balls off and you lose the weekend. The munchies vary in strength and can be a bugger as it takes longer to hit you so you may be tempted to eat more than you need. You can leave the coffee shop with your brownies and eat them somewhere you feel secure, but be warned, just around the corner is a huge gay bikers club and you really DO NOT want to walk in there by mistake while stoned off your bollocks on brownies All in all, enjoy yourself and like many large cities nowadays, take care of yourself and your belongings.