Long Pond is the largest LAKE on Cape Cod. A lake is deeper and almost always bigger than a pond, but on Cape Cod the founding fathers used the terms interchangably. Hinkley's Pond is also a lake. Both are good swimming, boating, and fishing lakes. BUT, Long Pond allows boats to go fast enough for water sking, one of the few lakes on Cape Cod that does. Hinkley's Pond does not allow fast boats. Both lakes are great for sunfish, peddle boats, kayaks, etc. Hinkley's Pond is much less developed along the shore, and has far fewer waterfront properties. Hinkley's Pond has had some issues with water quality, but check with the Harwich Harbor Master.