Welcome to the forums Larry.
So I guess you must get some surprised looks while in the water!
The Amphicar I have seen or road, never on the water, and I am sure that must be exciting and fun all at the same time.
Once I was on the ocean in my boat, approaching the coastline. Through my binoculars a mile ahead going slow, was some sort of 4x4 like land rover heading toward a boat ramp.
I could not believe what I was seeing. There were 4 passengers in this tank, and do this day I have no idea who made it or how it floated, and drove up the boat launch to land.
Numerous tourists took photos, the guy opened the door waived at all taking pics and carried on. Reminded me of the James Bond movie !