Obviously the classroom involves bookwork, writing papers, labs and practicing skills. The clinical portions are made up of ambulance rides, shifts in emergency departments and sometimes, for paramedic level training, you spend shifts with other branches of medicine to reinforce your knowledge of physiology. As an EMT you work on ambulances and medical transport vans. Providers at any level have the opportunity to work in many interesting situations. There are volunteer and paid first aid teams at sporting events, concerts and large venue gatherings, casinos, shopping malls and even cruise ships.
Many larger corporations use EMTs for quick response.
Bigger manufacturing plants and industrial settings such as oil refineries and off-shore oil rigs utilize emergency medical personnel. Some hospitals allow registered or certified EMTs to work in emergency departments. There are administrative positions as well which might include working for a service provider in the office with billing and public relations. I have also heard of insurance companies using folks with medical backgrounds in claims departments because of familiarity with the situations being billed. Most common is the ambulance response.