Chengdu, Kunming, Shangrila, Guilin - Winter

I would like to travel around south china as cheap as it´s possible with my boyfriend. We are young couple. We have 2 weeks in the end of December. And we read somewhere about frozen Yubeng waterfall where you can get on a pony (is it too dangerous in winter?) , or Rice fields in the south and elephants,.. or Li River at Guilin... Is it a good idea in winter visit these places? And in such a short time and find the cheapest way? It is very difficult find such a specific information on internet, Thank you ahead