Pull 6 plugs on the engine/manifold to drain.
Pull heater hose on one end of engine and blow to clear hose and radiator.
Remove intake strainer and dump out water
Pull v drive plug
Turn on ballast pumps to ensure no water between ballast pump impeller veins
Open and close QF valves to ensure no water
Extra pooh:
top off gas tank, pour appropriate stabil
oil change
oil filter change
replace impeller every other year
quick inspection of all hoses/wires/belt/lines