We've always gone with our cc team & rented canoes. There are specific launch areas. I'm sure you can bring your own kayaks, but if you don't have a campsite along the river you probably have to launch from the designated areas. I don't remember the various lengths of each launch, but we usually take the one that's about an hour. Have you called them to ask your question?
According to their website you can use your own canoes or kayaks if you're going on the 5, 10, or 20-mile trips they have available. You might want to check with their office if you want to launch from the campground.
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