Yes, launching your own kayak is $10. Bring cash, as they do not take credit cards. They do have an ATM but it's super slow and a hefty fee.
You can launch your own kayak or canoe, the pricing is much cheaper that way or may even be no charge for using your own. Just be prepared to carry it a small distance most likely
If you are asking whether King's Landing has two separate launch locations, one for rentals and one for privately owned kayaks, i think the answer is no. You'd come to this location, pay, and launch from the same place. When we were out on our rental, we saw several privately owned paddle boards/canoes heading back to the original launch location.
You can launch your own kayak at this location for $10. As fare as I know, this is the only location in the area to launch your own kayak onto rock springs run. The next closest launch is Katie's landing in Wekiva, where you launch into the Wekiva river & can paddle up rock springs run, the cost is the same, $10.
I am pretty sure you have to launch here. It is 10$ per boat or 20$ including pick up at the end of the trip.
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