I don’t see why you can’t take your luggage on the ferry to Manhattan, then take a taxi to your hotel. Red Hook Ferry is just a stone’s throw from the cruise port.
There is a ticket machine (credit card or cash).
No senior discount:($9), I think.
They have a schedule but not as accurate as I would have thought. Although I was “early” for the 10 AM ferry, we either missed it or…next one would be 11 AM. Then one showed up at 10:30 ish. Never figured it out. Someone said they sent another one (because the cruise ship was in port ???).
Much more to see and do in the city than Brooklyn. Airports are difficult to get to from either location.