Did this last year and it was a lot of fun, I've been asked to repeat, and here it is. Simply copying and pasting last year's write-up...
Recently I (finally) got to kayak in this area and absolutely loved it. The rock islands and channels here are so cool and you can paddle and explore for hours. You'll need a kayak or canoe to get to this event.
The posted coordinates are for a nice "beach" area on the southern point of Upper Bear Island. I'll be there with the log book from 11:00 to 11:30, after which you are free to explore the river via your water craft, picnic, geocache, fish, or swim. Bring sunscreen and plenty of water, trackables if you have them. Obviously, a PFD is a smart idea!
Note that you will paddle "up river" to the event, but honestly it is more like a lake than a river here.