Princess Maxima and Prince Willem-Alexander of the Netherlands had a good view of the ship parade in New York Harbor last Sunday from the deck of a Netherlands Navy launch. Many historic ships were on display just off Battery Park, including a replica of the Half Moon, the vessel that 400 years ago carried Henry Hudson up the river that now bears his name. The ship parade was part of Harbor Day, which also included outdoor concerts, free bike rentals and art exhibits in honor of Hudson’s discovery of New York.