What kind of doctor makes the most money for the least amount of hours and stress?

A good candidate for most money/least stress is dermatologist. They typically treat acne, wrinkles, rashes, and biopsy various suspicious moles and freckles. When something turns out to be serious, like cancer, they refer the patient to another specialist for definitive treatment. They almost never get called in the middle of the night for emergencies. A busy dermatologist can easily generate more that $1000 per hour.