O.k sooo let's just say... i've.. errrm.. invested in the sims (big time) we're talking bout $400 my friends...
So I'm pretty much an expert on everything sims:) so to be clear I' going to talk about what this game ADDS not the original base game.
violence: game didn't add any violence
sex: game did add new places to "woo-hoo" but It's not shown at all (just bumps under cover, and rose petals falling with sounds of giggling)
language: they speak "simish" :) so no swearing there:)
drinking, drugs, smoking: none, but the game glamorises drinking a little, they use names like "tropical treasure", and your sim has wishes to buy drinks sometimes, it adds drinking to the list of "glamorous adult things" so for easily- impressible kids, I would not buy this (base game is a different story)
messages: good and bad. You have to get your sim a job to pay bills (which increase depending on value of home), furniture, food, and other services, and products. The in-game job mirrors a real one, because you have to make your sim work hard to get promoted, and it does take up time for partys and in-game rec. activities.
On the other hand is glamourises the "clubbing" life, all kids want at one point. So again for easily impressible kids this isn't a good game. Your sim can go to clubs, got to bars, dance, have big parties, bar-tend, wear slightly revealing clothes, and become celebirties
role-models: some robot players wear the slightly revealing clothes... but no problem there really..
safety: perfectly safe!
as a teen, I love how the game adds apartments, and city life:), but not as good as world adventures, and ambitions