Last year I did a bustrip from Yangshuo to LongSheng. It was a complete daytrip starting in the early morning and return in the evening. The bus trip was at least two hours, if I remember correctly. You pass Guilin and the mountain roads are not that easy.
The scenery is certainly worth it. Just beautiful climbing up the mountains full of rice terraces and walking around the small minority villages...
You can get the tickets in every hostel in Yangshuo.
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