its beautifull there,i live 15 minutes from lake ontario and drive 2 hours from my house to get to my boat in georgian bay and its worth it.
my wifes family bought a cottage there around 5 years ago and after a few day sails on a hobie i had to bring my boat up there.
it is the lower part of the canadian sheild so there is lots of islands to moor off which have many clean sandy beaches,coves,channels going thru the islands where you can moor, the winds are very consistant and in the past five years i have found the weather to be very predictable.
theres enough islands and beaches for a different destination every weekend and there is always a party/rendevous going on in the different islands during the long weekends (the best months are july and august and the water gets warm around then).my wife was scared to death of sailing when i met her and hated lake ontario and for a while i didnt sail very much.since ive had my boat up there all these factors have made it enjoyable for her and she looks forward to getting up to the boat as much as myself which has put me back where i want to be....on the water.
best islands in my opinion is beckwith,bosoleil and giant tomb,.christian island is nice too but is also a native reserve so you wont have as much privacy and ive had a few run in's with restless native youths there.
we see alot of american salors there during the late summer months,most of them power boats