how to go li river, yangshuo and others attractions for 1 day tour?

One day's time is not enough for touring around these places.
You need at least four days: one day in Yangshuo , one day in GL downtown area including the elephant trunk hill, and the rest of two days in rice terraces.

In GL downtown, you can reach various sites by city bus.
To Yangshuo, you can take a cruise ship to appreciate the Li River secenry. While return, long-distance buses are available.
There are more than one rice terraces in that area, which one you are going to? Then I can tell the transportation method.