When Holland America Line’s ms Westerdam emerged from a 12-day dry dock at Fincantieri’s shipyard in Palermo, Italy, in late April, the ship debuted major renovations that added many new public spaces and amenities, including two firsts for the fleet: Explorations Central, or EXC, in the Crow’s Nest and Rijksmuseum at Sea. Westerdam also received the popular Music Walk venues ...