Does anyone rent out the dock space at their STR?

[Amy Mead]

I was thinking of a charging a dock fee if the guest brings their own boat or rents a boat locally. The dock has space for a boat and a lift for a small boat. I would like to offer this as an amenity but I want to cover the extra wear and tear on the dock. We would NOT provide the boat and I would not want to charge for guests that do not want to bring a boat. Also, what kind of liability or how much extra insurance do you need if you offer kayaks and life jackets as an amenity? Or insurance to allow guests to dock a boat?