Scusset SP is upper Cape...right on the beach at the end of the canal. Nice spot, if you can get in. Good striper fishing here. 2 hrs East is Nickerson SP, big park. Good spot to see the outer Cape from (Cape Cod National Sea Shore, Race Point,etc).
You might book a couple of days at each to minimize driving around a lot. There's plenty to explore from each.
PM if you want more deets. We live right next to the Cape, in fact my Wife is down there for 2 weeks with the camper...
Bill