Every-time I go into The Sims 3, Oasis Landing is never in the list of towns to choose from. I've uninstalled and reinstalled the game but that didn't work.
Like abigail said its a sub world like Uni and world adventures. You go in to your game in any main world then a travel thingy falls out of the sky, most of the time it is in your yard, if there isn't enough room then its on a community lot, then click that there are quests from there.
You have to start in one of the regular worlds, shortly after that the time traveler will appear and give your sim a task to complete. Upon completion, you will have the opportunity to travel to OL.
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Mylita