Labor Day weekend

Thinking about making the trip from Ashland, MA to the cape. I would have Friday off (and of course Monday too). It's the last chance I will get to have a long weekend off like that. How busy are the beaches? I am assuming that there isn't really anywhere along the cape that is close to do day trip(s). I don't think I want to pay for a place on the cape if its just going to be a shit show everywhere that weekend. Are there parts that would be worth staying at or visiting that don't get as much traffic? what is parking like in terms of cost? Was also kicking around the idea of Scussett beach, but probably going to be just as busy if not busier.