Mola Mola aka Sunfish in the Hamptons, NY

I found this Mola Mola aka a Sunfish hanging around Southampton Village yesterday. It was the first time I've seen one on the move, flaring it's pectoral fins.
I remember growing up at the beach and seeing a large fin and everybody thinking it was a shark when it really was a sunfish.
According to my estimates, this sunfish is just under 6 ft long, which would put it in the range of 650 to 700 lbs