well you mention spain... the only reason thats good is coz its packed full of punters (mainly beach resorts - best of all Ibiza - but also large cities such as Madrid, Barcellona, etc...) and tolerance on weed is high... though laws on chemicals are pretty much the same as anywhere else in europe...
Eastern europe looks dodgy too me... the only thing going on your side if you do get caught is that the police force is heavily corruptible (though that can be a double-bladed weapon)... also, going there would be interesting mainly for heroin (bit of weed growing around albania too, but its pretty rank shit)... possibly cocaine (though you would need good connections for that) and good for picking up a few kalashnikovs too... anything else forget about it...
if an ez, cheap time, smoking lottsa grade A weed is what your after, I would suggest north africa (probably marocco is no.1 choice)... good weed, dirt cheap food/residence prices, friendly people (providing you dont act too touristy & open yourself to getting fucked over)... again, heavily corruptible cops if you do get into trouble...
montecarlo is probably safe place for drugs too... providing you have a 6-figure salary, drive a porsche & date a super-model... so that counts many of us out...
thats about it i believe...