Firstly, you need to carry your valid ID proof. Due to verification purpose, the staffs may ask you to show your ID card. This is applicable only for adults and not for kids. Secondly, you need to carry a towel and a pair of clothes to keep you dry and warm. It is highly essential once you get down from the river boat.
Thirdly, you can wear a sports shoe as it helps to get some grip. And finally, don’t forget to bring your high-definition camera. But, just make sure it is not getting wet while riding.