I have two suggestions:

1) Jamaica. Weed is illegal there, and they do punish people for it, but use is very widespread anyways mainly because of Rastafarian influences.

2) Aruba / Netherlands Antilles. These places are ruled by Dutch law, so presumably weed should be as tolerated as it is in Holland but I don't think there are any coffeeshops. Anyhow, I'm not quite sure about the situation there.