Chapin Beach is located in Dennis, Ma, on the bay side of Cape Cod. The parking lot is small, and you will need to arrive early, at least by 9:30/10am. This seems to be the case with a lot of the beaches on the Cape, and probably even earlier than that!
When we first arrived, it was high tide, and difficult to navigate in the water. You absolutely need to have water shoes or flip flops for this beach. There are LOTS of rocks of all sizes at the edge of the sand. There is a beach to set up all your gear, and for the kids to play....... The spectacular part of this beach, and probably one or two beaches near by, is as the tide goes out, you can see large sand bars and beautiful water. The water between the beach and the sand bars is not very deep, and if you are up for a walk in the water, trek over. It is gorgeous! The water was warm, clean, and gentle. I felt like I was in the Carribean! As the tide continues to go out, the space between the sand bars and the rocky areas becomes a haven for small sealife to crawl the rocks, and for children to explore. Needless to say, this area then loses the water, and the rocks are exposed. If you want to swim, you'll need to walk out to the sand bars until the tide starts to come in again.
I encourage families to either have an inflatable boat/raft, so you can float some chairs or other things over with you. If not, just go with nothing but your bathing suit and water shoes. this is what we did, and we just laid in the water and floated on our backs until we were ready to walk back to all our stuff on the beach.
It would probably be very difficult with an infant or small toddler. I did see a few people with small children floating with them with a swimming tube of some sort, but keep in mind when you walk back to your belongings, if the tide is still out, you will need to carry the baby back. Our beach neighbors had a 7 month old and a 3 year old, and they decided to make the trek across to the sand bars.
My 5 year old boys did not have any difficulty, and were able to touch the bottom at all times.
If I was rating this for just adults, I give it a 5, but since it can be tough for really small kids, I rated it a 4.
They have one lifeguard on duty, and one port-O potty.