The closest place to really good tuna fishing is Truro, Wellfleet and Provincetown. Between access to Cape Cod Bay and Stellwagen Bank they are the closest to really good fishing. After that, Chatham. Out of Chatham; off Crab Ledge, the BC buoy, etc is good.
Avid Fisherman/Realtor Will Raye
Most of the tuna are caught well offshore in the Atlantic ocean. There are several harbors that provide good access to these fishing grounds:
Harwich: any of its three harbors
Chatham: Chatham harbor and Stage Harbor
I would call my husband who is a Charter Fisherman with a PhD His networking would fill you in and the suggestion to call the Saquatucket Harbor Master is paramount. Mike's number is 508-432-1696. I am a broker for Kinin Grover at 508-432-8800 Mary Andolina
I would go to HYANNIS Harbor and there is a fishing boat that takes people out TUNA fishing off of Martha's Vineyard. Tuna's are really big out there! We can sell you a great home to stay in while fishing off the coast of Cape Cod. Talk later, Sue Brown