I just love being on the water in a kayak. I think it may be the best way to enjoy the water, if you aren't actually swimming in it.
The distance between #3 and #4 is due to interference from other creative caches in the area. Once you are at GZ you will have to branch out a bit.
It will all come together once you are there. So what are you waiting for? Strap your floaty thing on your car and get down to the river.