There are definitely options for how to obtain this cache. I have listed parking/boat put in coords so you can attempt this and other caches at the same time.
Get ready to face your fears. You will need to get over a few of them to get this cache.
This cache is rated a 5 terrain for a reason. My suggestion is to use a kayak. This cache is not for everyone. It is not just simply rowing down the river, as stated, you will have to face multiple fears.