Klias river cruise is great outdoor experience. We were the only boat in the water the other day. 2 hours car ride from Kk and we are there for high tea. Around 5pm, we were i the boat for a good 1 1/2 hours. Saw lots of monkeys and Joel (TG fr Amazing Borneo) is informative and described the monkeys in great details. Then after dinner we gone back on water to watch firefly. The tree lit like Christmas tree. Overall great experience. Should try.