The only other official one right now for Sims 3 besides Sunset Valley and those that come with Expansion Packs is Riverview. To get it just go to thesims3.com, it's free.
However, with new EPs (Expansion Packs) it is possible to get new towns. A few, such as Seasons, don't come with new towns but pretty much all the others do.
If you don't want to spend more money on them you are able to get worlds from the Exchange that were made by other players.
If you want to make your own worlds, you can download the Create A World from The Sims 3 website.
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Sims 3 Pets is an expansion pack for the sims 3. You need the sims 3 to play it. The Sims 3 Pets adds pets to the game, as well as a new town called Appaloosa Plains.
It is rare, but you can find it in worlds like sunset valley. If you have WA you can find it in france.
New update for the sims 3
But it does:) Get a new one
nope, your family will stay the same but if you start a new game, the sims 3 families that you made wont be in the new game that you start.