I got carried away on this one, but...
Well, as for appearances:
1981 CC Ski Nautique
1982 CC Ski Nautique 2001 (hood scoop as well as sticker/vinyl change)
1985 CC Ski Nautique 2001 (notice the sticker/vinyl change)
1987 CC Ski Nautique 2001 (notice the sticker/vinyl change, split windshield, and another hood scoop change)
1989 CC Ski Nautique 2001 (another vinyl change, back to single windshield)
All pics taken from CorrectCraftFan.com
I think that is pretty exhaustive as far as exterior appearances go... Anyone want to add anything? Heh...