Windstar Cruises announced a new requirement that all guests be vaccinated against COVID-19 prior to sailing. Upon arrival at the cruise terminal, guests will need to provide proof of a full vaccine treatment (if it is a two-shot vaccine, the second shot must be completed 14 days before boarding.)
Windstar Cruises offers small-ship and yacht cruises at over 150 ports around the world. Their 2022 Great Lakes Cruise offering includes an 11-day Montreal-Boston itinerary, sailing in September and October 2022.
The cruise line is offering their "Beyond Ordinary Care" program, representing a multi-million dollar investment in HEPA filters, UV-C germicidal irradiation, and other upgrades to provide a healthy environment. They are currently not sailing, but are offering 2022 and 2023 voyages for sale.
Source: Windstar Website