Can you bring your own sit on top kayak and be shuttled from resort?

I've done it before even with a big sit in style and they did not charge any extra fees to haul it to the drop point. But it made for a cramped bus ride because they transported it in between the seats of the bus, making it a little bit hard to walk through the aisle

Yes, for a small fee

Yes. For a small fee they will take you up river. I think it was $5 a raft (or kayak)