Floatplane Endorsements
Melbourne Seaplanes currently has only one C185 operational and it is not being overworked.
You will not be asked if you have a boat drivers licence, as and when you go for a float endorsement, but the experience apparently helps. My float plane mate advises me that having boating experience gives you knowledge and skills that you will/can use when flying floats.
PS. Wear slip-on boating type footwear.