Maybe be you prefer to walk, well, you can take a walk among those tea plantation. The air is still fresh. It gets cold in the afternoon, you might want to wear sweater if you can't stand of cold like me.
Ah, not to forget you can try some fresh vegetables, such as tomatoes. Some farmers go to and from carrying their crops. Those crops surely look very tempting!
About the rafting thing, if you are not an experienced person, no need to be worry since there's some guides who will help you. And the current is not that big, if you come during draught season^^.
So, what's with the wait? Refresh yourself there!