Amsterdam is fantastic for us europeans (where u from - u.s.a ?) because it is obviousley close and u can legally buy and smoke very good weed,
as long as u are careful enough you can smoke to your hearts content at home or wherever u are now, u don't need to go on holiday to do that,
what i'm saying is, if your parents are ready to give u a holiday of a lifetime,
you should do something a lot more constructive, something that is different to what u do at home, why else fly all that way around the world ?
i've been to a couple of places, California, Baja, Amsterdam, but the best was Australia, i went to Sydney ( did the harbour bridge climb - what a buzz ) and went on a long drive around the west coast from Perth upwards, "Oz" people are some of the most laid back, and pleasent people i have ever met, theres loads to do and u can't go wrong with the weather (unlike Europe),
i totally recommend u go to Australia - u will never regret going.