Contact Estela Ros at Rancho Baiguate, and book with them.
estela@ranchobaiguate.com
She will be able to tell you the rates and how they operate.
Went with them many years ago. And my sons and nieces have done their summer camp and have gone many times. They run a very professional white water rafting operation. You need to reserve the day before you go.
Rapids in general are of course dangerous, and thus one should only do them with a professional outfit. But if you follow the instructions, you will be fine. These are middle level rapids, making them very exciting.
Well worth it. Go for it.