Theres many things you can do. You can work for a pharmacy chain as a technician, shadow a pharmacist so usually in a hospital or privately owned pharmacy or volunteer in the hospital pharmacy by talking to the volunteer office in the hospital.
It would be a tremendous PLUS if you have the pharmacy experience.The knowledge you'll earn could reduce the stress when it comes studying in pharm school. You will be more familiar with the drug names, strength, dosage form, and insurance issues.