Most areas nice for kids. Just remember that the water in those inlets / creeks moves faster than anything you have in CT. I pulled a kid out of Scorton's 5 years ago.
You MUST take the kids to the Fish Hatchery which is nearby of 6A - bring plenty of quarters for the fish food.
Go to the Sandwich Glass Museum. The Featured artist is Nebe from here (you owe it to him after battling in the Political Forum
)
Marshland has good Breakfast.
Great place to go on the Cape without spending a lot of time in the car.