I was stationed in New London Ct,just over the border from RI,in the 80's.Lots of charters along the coast.I went out on a boat called the "Hellcat" out of Groton Ct.Caught many bluefish off of Montauk.Bass all along the coastal inlets bays,Long Island sound and Block Island sound.
Haven't been in the area in recent years but you should not have too much trouble finding charters,now that the stripers are back in big numbers a lot of people cater to bass fishermen.
August is a great time to fish for Bass,Blues and Tuna off of New England.Albacore run in the area as well
Wish I could give you better info
Good luck on your trip
My lab is still the best hunting partner there is.