Wuyishan Bamboo Rafting and Impression of Da Hong Pao

Hello

I will be visiting on 9/22/17 and 09/23/17.

-For Bamboo Rafting, do I need to make reservation in advance or when I arrive? If I need to make reservation, where/whom should I contact? Do I still need to pay entrance fee if only do bamboo rafting?
-Impression of Da Hong Pao, would I be able to buy tickets on either those 2 dates after arrival?

Thank you very much!