I'm from Guilin. You need 5 days or more to enjoy your trip in Guilin. There are many new scenic spots developed recently which are worth to visit. I have go back to Guilin 6 times in the past 6 years. I still miss it very badly in particular its rice noodle. anyawy it is a place that would make your trip worthwhile an dmemorable...
I can give you more detailed infor if you are interested in...