Hi Rozer!Welcome to Guilin and i hope you have a nice time here in Guilin.This is Mickey speak from Guilin and i'm the local people here.
Well there has no boat dept.from Haikou to Guilin,and
you can try take bus from there to go,there has no
deriect train to Guilin neither.Cause Haikou is an
island place.
And the bus to Guilin,it is sent at 15:30 and it cost
238 Yuan.and it trains about 21 hrs on the trip.it is a sleeping bus to come with.
And that is my information for here,and you can go to ask the bus station if you wanna know more.