I highly doubt the SpongeBob 3D will be back. I saw it once this year, and it just plain sucked.
I know, kiddies might like it. But, it's been there 2 straight seasons, and AT usually cycles stuff every 1-2 years.
Back to the original topic.....
The COULD drop a ball on the tower, as long as it didn't weigh too much. Just put a pole on the top for the ball to be attached to.
Shaggy said that the main parking lot will be open for this, unlike the Boomerang bay tour. So you should be able to just go in the main lot, and walk to Security post 3, which is to the right of the main entrance, by Human Resources.