You jump between islands (well, still shots of islands), you give and receive arbitrary gifts from Zack and the other girls which supposedly determine who will and won't be your friend (these girls really are quite shallow y'know) and you play a bunch of dire mini-games. If that sounds fun – Paradise is the place for you, or Zack Island, or, whatever it's called.
If however you're just looking for a quick fix of girlie action, please, just watch the games intro video online – it's the best thing about the game by a country mile, and it's free. Failing that, just buy some porn instead – it's cheaper and tends to get to the point a lot quicker. 35/100