First off the KEY, is to have an amazing Camp Director called! We have had an amazing camp director the past couple years I have been in and it really helps to have someone great in charge of the planning.
Second...."YCL's!!!" or whatever your ward calls them are crucial. They are usually the Laurels. It is Young Women or Girl's Camp after all, not leader camp ;) It is so important to have the girls help in planning camp. Their ideas need to be listened to and they need to have assignments in planning and carrying out camp. I can tell you that during camp is where I have seen the girls just SHINE!
Third... Make sure everyone is on the SAME page. Start by having a camp theme and have a few meetings, delegate responsibilities and start early, don't leave things until the last minute. Every single leader called has amazing talents and abilities. Use those abilities to help carry out camp. That is what helps make our activities successful, everyone contributes!