we are willing to come to guillin on july 2014. are there any trips we can join for 3-4 days?

Yes, of course.
For your situation, I alway book a local tour for traveling and ask my hotel to help me to arrange.
If you want to join one include all, you may try to contact the TravelChinaGuide.com. As i know, it is a nice good tour agency in China and many of my friends use their service. Their booking email is travelchinaguide.com|tours. I heard there is a large discount currently and may be you can ask them.