If you want to fly the floats, the best way to get those water landings up is to fly for Alligator Airways in Kununurra. They have a 206 on floats and will hire a newby.
Also Broome have a few 208 operators that will hire low time guys.
Keep away from a certain float operator in Derby
If you want a GA career and an interesting relaxed lifestyle, floats is the way to go
Washing the tanks out each night, cleaning the aeroplane along with cycling fresh water through the turbine can be a downpoint especially after a long day
