I no a few fisher man that stay at them spots. They are great for a few guys who want to get toghter and fish fish fish!!
But for family no way, Just not anough to keep the rest of the family busy!!
If were me I would be staying around the Harwhich, Brewster area, It is close anogh for the fish, beach and the mid cape for a day with the kids.
I don't no your budget?? or your camping gear but try here, I went there 1 time last year and had a good time!! going to go again this year
Good luck!!
http://sweetwaterforest.com/