This is similar to mine. In a perfect world I would be camping out on the U.S.S. Intrepid in New York. Its in the water, but probably like 30-40 feet above it. The ship also has a massive interior, with bathrooms, kitchens, bedrooms and storage rooms (all without power of course). It was converted to a museum but I'd take the ramps off to deter zombies. Basically you would be in the eye of the storm. (Surrounded by one of the largest infected cities on earth, but still untouchable)
Much like yours. Fishing and boiling. I'd have filter systems built on board. Smaller boats can also be deployed from the big ship to search for supplies. That means my group of survivors could search less dangerous parts of the city for non perishable goods if it is deemed safe at the time. The deck of the ship would be a prime place for solar panels as well, if I manage to scavenge any.