The best geologist has seen the most rocks. Get out into the field as much as you can. See if there is a "Roadside Geology of (insert your state)" book you can leaf through while on road trips.

Find a favorite beer and have it handy to help you through long nights in the labs. If you have a good petrology series, you will spend a lot of time at the microscope writing detailed reports about rocks slides especially with igneous rocks. The beer will help immensely.

My structure prof always maintained the following: In the field, if you become confused, stop and be still. The Earth will speak to you.