"Getting ready to jump into the river"
We did some white water rafting at the suggestion of my friend. We drove there ( I think the place was called Telagawaja, alternately you can also do white water rafting at Ayong I believe). It was quite fun and they do have very well prepared equipment, life jackets and all as you can see.
They have several guide that take care of you while you raft so it's pretty safe - about a guide to every 3-4 persons.
Sometimes it reminds me of tubing down the river when I was in Taman Negara, cause we did jump out of the raft at the rock free areas.
How much was it? Well it was quite a while ago, so I can't say I remember exactly how much we paid..but I think it was about USD 35 thereabouts.
I believe you can book a similar trip via your hotel. It might costs more though if someone had to come pick you up from the hotel.
Would I go rafting again though? I don't think so. Not at my next trip anyway. There are other things on my mind.