Outer cape. Wellfleet, Orleans. I doubt you will get too many specific spots, other than well known ones....
Just head to the national seashore, your will find spots any and everywhere along the entire stretch. There are better spots than others but each winter creates new breaks.
How crowded is cape cod this time of year? I'm road tripping up that way next week, and looking at getting in a monday session either there or rhode island as long as the forecast holds up. Seems there is a lot of room to spread out on the cape, but I also don't like complete isolation.
It wont be crowded at all this time of year. People usually start going to cape cod once memorial day weekend kicks off.