Unfortunately, I've been a ED patient way too much in the last six months so this is coming from experience. I've seen what ED volunteers do (both in the community and academic hospital setting) and I must say, that I do not consider going and getting a patient a towel or cup of water as being 'clinical' experience. You want really good experience? I would say get involved with EMS. I have been involved with EMS for 7 years and I love it. I think it is the best pre-med clinical experience because its you and the patient (if you work a paid service like I do) in the back of the bus with the patient. If the patient codes, you're doing CPR alone until you get to the hospital. Get involved with a good, forward-thinking, busy EMS service and it's the best. If you think about it, there is not much of a difference between the initial assessment of a EMT-B and an ER doc.