Hello, I will be visiting Guilin in December, and have two questions for you.

1. Is it possible to buy a ticket for the Li River Cruise in Guilin without having to reserve it ahead of time? I don't have a credit card so cannot pay for it online.
2. What is the public transportation like in Guilin? Are there buses that run to the Seven Star Cave/Longji Titian/other attractions? Would I be able to go to these places on my own without having to do a group tour?