Here's bus operations largely taken over by boats, the so called vaporetto. It took about 10 minutes to go from the airport to the harbor, where the Alilaguna blue line departed at 3:15 pm.
Video from my Alilaguna water bus trip:
We arrived at St. Mark's Square at about 4:45 pm and at 5:00 pm the Hotel shuttle boat departed for the Marriott hotel from St. Mark's Square.
It took about 20 minutes to sail to the JW Marriott hotel with their private boat. In the background Sola di San Giorgio.
Located on the island of Isola delle Rose in Laguna di San Marco. A private island where there is only JW Marriott hotel.
... And a video with hotel shuttle boat:
Follow my shuttle boat trip from San Marco Square to JW Marriott Venice Resort & Spa, located at Isola delle Rose, JW Marriott Venice Resort and Spa is located on its own private island in Venice, Isola delle Rose, just a 20-minute boat ride across the Lagoon to St. Mark's Square.
The hotel offers a complimentary shuttle service to and from St. Mark's Square, on a regular basis.