Visitors and residents now have an opportunity to discover Salem by boat. The city recently initiated a Salem Harbor Shuttle boat service. The water shuttle is being operated under contract for the city by Boston Harbor Cruises, which also operates the Salem Ferry commuter boat. The shuttle will make regular stops at four locations: the city docks at Blaney Street, Congress Street, Winter Island, and Salem Willows. The waterfront stops provide users with convenient access to the city’s many historical, cultural, and recreational assets, as well as shopping venues, officials note. “As we continue to revitalize our historic waterfront and expand public access to this treasured asset,’’ Mayor Kimberley L. Driscoll said in a prepared statement, “the shuttle service promises to be an integral piece of those efforts.” She said the connections provide “a unique method of getting around Salem’s waterfront public parks and sites. . . . Just as important, it signals another step forward in our work to make Salem Harbor active, vibrant, and open to all.” For more information, including schedules and rates, go to bostonharborcruises.com.John Laidler can be reached at firstname.lastname@example.org.