S.O.t.B!! Later could be better and I'll give you some food for thought...
Stripers are called Rockfish from Delaware south for a good reason, they like rocks! So with that in mind, what are the two prominently "rocky" sections of Nantrashket?
First Map - See that first point (not the rocky outcropping - that's a swim) where Atlantic Hill meets Nantasket? Fish that at night with plugs & eels (and Korkers & Waders) with a moving tide. That furthest rock is only available on the bottom half of the tide and you'll get cut off at high...
Second Picture ... shows where the beach meets the rocks, right around that restaraunt at the end of the parking lot
Check it out during the day at both High tide & Low tide to get an impression for the spot
- and then fish it at night