On Easter, Emily and I took my inflatable kayak (a birthday gift last year from Emily - best gift ever!!) out on the Kilauea Stream, which dumps into Kilauea Bay at Kahili (Rock Quarry) Beach (click link to see pictures and read about my adventure exploring the nearby lava pools).
She was going to lay out on the beach but then decided to come at the last minute, and I happily paddled along as she was even more content to lay down and be treated as a queen being paddled up river.
This excursion is not mentioned in most guidebooks because after a half-hour you pretty much reach the end of the river. It's private property, but I explored just twenty yards upstream to find an ideal swimming hole with a rope swing. It's a shame that places like this have been bought up and now people are prevented from enjoying some really cool, unique spots on the island. Technically, rivers and beaches are supposed to be public, but increasingly people are buying up lands and preventing others from gaining access. What a shame!