I'm so glad you're enjoying 2, it's my personal favourite! I strongly recommend reading about how to avoid corruption in your game; may not be the funnest thing, but it'll save you a lot of headaches in the future.
I personally love creating my own neighbourhoods, you can really let your imagination run wild! If you want to spice up your game, there's a whole world of mods out there (big fan of the Sim Manipulator, myself) and great custom content. And if you have Open For Business, remember that you can make a successful business out of almost anything (I've ran everything from graveyards to cinemas as businesses). Legacy families are really fun, too, and especially work well with your own custom neighbourhood. If you don't want to construct one yourself, you can always download other neighbourhoods.
Now I want to play The Sims 2 :D