Wow, thats a hard one. Well, Amsterdam ISN'T the place to be.
Holland has a lot to offer, mate, i can't recommend a place, to be honest. Every "provincie" has it's own character, so it could be worth, travelling criss-cross through Holland? Maybe with a rental-mobile-home?
It's just a suggestion for seeing a lot of Holland in short time. Holland is a small country, so you could see the "big lines" in a few days.