There are some places to stop and rest during a swim, e.g. swimmers from the Island often stop and rest at Michael Hough Beach, or on one of the buoys or lane markers such as red marker TE22. Even-numbered markers are red + pointed and odd-numbered markers are green + flat, and people often remember the saying "Red right returning" (having the red marker to the right while returning), i.e. going out, the red marker is on port side and green on starboard, and the reverse returning.
We never swim alone, always wear a towfloat, preferably a nice big bright orange 11-foot vessel, and ideally we have a few vessels together with a group of swimmers for safety.
Next rest stop is the Westwall (breakwall to the West of Michael Hough Island = Ontario Place West island).