Don't be a jerk
In all seriousness, litigation happens when egos are involved. Be nice when you leave. Do not make threats, do not challenge the work ethics of others. As your first grade teacher told you - "If you don't have anything nice to say, do not say anything at all."
Do not take things with you
Please don't start deleting files from your work computer or sending client lists to your home email. When you leave, and IT department wipes your computer and learns of this conduct, they will assume you have done something unethical and plan to breach your employment agreement.