We know about the LI River cruise between Guilin and yangshuo.

I'm afraid you cannot stay overnight in Xingping or Yangshuo from the cruise because the boats from Guilin to Yangshuo only set out before the noon and arrive after 4 -4.5 hours. Then the boats travel back to Guilin without passengers. And the boats pass Xingping but don't stop. So if you want to visit the place, you have to get there by bus.