Loon lake in Muskoka is a spring fed lake 7 minutes to Gravenhurst and 1.5hrs from Toronto.  This lake is fabulous as you can boat into Turtle lake and in the fall you can portage into Muldrew lake which is another very popular lake in Muskoka.
The communty is close knit and they have a strong lake association.  The water is monitored and kept very clean.  There is garbage pick up and the roads are municipally maintained.
You can do all of your desired water sports and there are no motor restrictions.
Come and take a look at my listing on Loon Lake in glorious Muskoka.