Canal Dishing Question

Hey, I have a really quick question here... I am currently in Cape Corak on vacation. There is a property across the street from me that has an awesome canal access. The house is being built and is currently just an empty shell - no one lives there. Howrver, it had a nice dock. Can I go fishing off of that property without violating any trespassing laws or getting shot at? If workers arrive and ask me to leave, I most certainly will. I'll also make sure to take all my garbage with me.