Hi, head for LEIDSEPLEIN which is in the centre of the city where you'll find the Bulldog smoking coffee shop amongst others as well as bars shops places to eat. Theres always something to see while your chillin like jugglers, sword swallowers fire eaters ect. Vondelpark is good if you fancy a lie down, there's a pop festival there most summer weekends where you can smoke a spliff and sun bathe with out any one taking a blind bit of notice.
If you do sample the weed, remember it's very strong my hubby and I got lost for hours, we couldn't remember our way back to the hotel, got on a tram and got off at the wrong stop and every canal bridge looks the same and if you stand around for long your likely to get a bicycle parked up your bottom as they are every where.
I'm sure you'll have a fantastic time Let me know if you've got room in your suitcase and i'll come. Lorraine.