By coincidence I took my niece and her three daughters on the Circle Line about two weeks ago. Here's a photo. Yesterday's cruise was a chartered circle line boat set up to tour and lecture about NYC infrastructure. Here's link to the tour if anyone is interested.
https://www.eventbrite.com/e/bridges-and-tunnels-boat-tour-tickets-64261462765?aff=eemailordconf&utm_campaign=order_confirm&ref=eemailordconf&utm_medium=email&utm_source=eb_email&utm_term=viewevent