Yes you can now! You have to have the sims3, by itself, you WILL have to buy the sims3 pets, which you can get from gaming sites, the best one is The Sims3.com. :)
No
buy birthday cake
You can buy the CD from a shop or you can buy from the internet and download .
You would have to buy sims 3 World Adventures.
buy exercise equitment
Buy a stroller to push.
You buy the game, install it and then you play it.
Of course. Just like Sims and Sims2.
There are no spas or hot tubs in Sims 3 yet
You cant buy more land but you can sell your house and move into a bigger one.
***ON PC VERSION*** Buy it from the Buy Catalog. It should be under the plumbing section (where you find the showers/tubs).