The upper deck is vast. If i were you i would have turned to dictionary.com instead of answers.com first. In the dictioanry the give you and example of the word and they define it. Pretty simple.

The ocean stretched out before her, vast and boundless, offering a sense of freedom and endless possibilities.

Answers to this question encompass a vast universe of possibilities. The game Scrabble has been around since at least 1948. Something new that did not exist then is the digital camera.

Possibilities.

The possibilities were endless.

We need to list all of the possibilities.