I'm surprised no one mentioned Treasure Island Marina. It is east of Kingston, and west of the Trident club.
A friend has a 35 Catalina
in there, and we stopped by in September to get fuel
for our boat ( 5.5 ft ).
Iriquois has a gas dock
, lots of area for putting your boat on land, and a travel lift
, and is at the first lock leaving the Great Lakes
. It is a at the junction of the 416 and the 401, so is a fast drive from Ottawa. It is a days motor
to get to good sailing area though. This is where I bought our boat.