[Legolas]

If you're playing a chaotic neutral character, think of him/her as trying to make the most of ther lives. Rules are only a restriction, life is about having fun. If you feel like taking a risk, go gambling. What you gamble away doesn't matter, because once it isn't yours anymore, why should you worry about it?
In some ways the CN alignment is like the NE alignment, except that you're not after power.
Your character has a hyperactive imagination and is constantly thinking of new ways to have fun, and carrying them out.

If he or she is travelling with a party trying to do good and someone's telling your character about a great evil, and you thinkk it's fun to push that person's nose and make a BEEP sound, by all means do. You aren't crazy, just free to enjoy life as you see fit.

The unpredictability comes from your desire to keep trying new things as old ones grow boring, and whatever ideas pop into your head. One day you may want to go out and kill an orc because you wonder how his clothes would look on you, another you stay indoors because you want to roll the dice that day or simply avoid the orc's stinking breath.

You feel there's no need for rules, and there's no need to explain yourself to others. Those are the main aspects of the alignment. Why you became an adventurer (and stick with the party) and what you think is fun is up to you.