Re: docks on ICW
aaron, in most states there are different degrees of trespass defined in the laws. Merely crossing or entering an UNposted, UNmarked, UNfenced property with no on there telling you to leave, is usually accepted as "no harm no foul" and not even a fourth-degree trespass. In some states, the landowner is even required to post the property--or else accept anyone reasonably crossing it without complaint.
However, tying up your boat to a dock? That's not just crossing a property, that's attaching and making use of what is obviously someone's property, cleats don't just pop up like mushrooms in a field. I wouldn't be surprised to find that tying up manages to make all the difference and create grounds for a summons.
Make a t-turn in someone's driveway? Sure, that's common enough. But park your car there? No, that's gonna be a problem.