u/kp232323

I am having my bachelor party in Cape cod September 10-13, and want to go on a bluefin tuna charter one day. There will be 6 of us, and 4/6 are avid fishermen, while 2 just enjoy being on a boat. This will be my first time in Cape Cod, so any charter recommendations would be greatly appreciated as well as anything I should be aware of/prepared for. If we book a charter for bluefin tuna, would be strictly be fishing for those or would we fish for other species as well?