As I've recently posted (I think) the Jacksonville Port Authority has recently decided to cease funding the Mayport Ferry, which provides ferry service between the historic fishing village of Mayport, and connects one side of scenic A1A to the other via the ferry service.
It may not be much shorter than driving from a time perspective (the ferry runs every 30 minutes from one side to the next), it certainly is more fun than the extra drive, and is scenic to say the least. It's my favorite way to get to Amelia Island and Fernandina Beach.
The funding is to end this coming September, and there are various efforts to find alternate funding/operational sources, and here is a meeting that could yield some solid information.
If you live locally, you can also "like" Save the Mayport Ferry's Facebook page here.