The deeper, current heavy waters (in which my island lies) do not experience ANY warming effect by the hot weather. Zip. Any swimming or snokeling requires a decent wetsuit or else hypothermia will by your friend. HOWEVER, on nearby Vancouver Island, and particularly on the east side, there are places (Parksville, Qualicum) where the tide goes out for MILES, leaving a huge expanse of sandy ground, which will heat up in the sun...and when the tide comes in over that warm sand, the water heats up like a freakin' bathtub...R@63, that's your best bet for some comfortable ocean swimming. I also like it for practicing my kayak rolls and fancy rescue techniques. I am a wuss when it comes to cold water. :-)
For the meetup I am going to try to catch some fish the day before - I would love to bring some of my killer fish tacos with an accompanying chipotle slaw...so, so, good.