Yeah, I have the contact details for Eddie at the Bono River in Sumatra. There are crocodiles and shit, but there’s footage of locals paddling into the waves. Eddie rides a jet ski alongside you and takes footage.
It’s an all-inclusive deal — I think it was around USD $300–350 per day, including meals and accommodation. I’m not sure about transfers, as it’s pretty remote. You can fly from Bali or Jakarta; Jakarta is the easiest.
The best times are during full moons for the massive tides.