You can kayak without a tour but I don't think there's any transportation to/from your vehicle. It's not a far walk but it's probably easier going with an inflatable kayak since they're much lighter to carry. The tours make it easier because the kayak equipment is set up at the launch and you just get in and go.
Yes you can kayak without a guide. They have times when pick up is available.
It's not a far walk at all to the landing site where you get on the kayak, and I'm not quite sure if you can kayak without a guide, I think you can
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