Some "lifestyle" specialties have HARD residencies - like radiology - test after test and call after call...
Even Psych can be hard seeing all the ER Psych admissions.
I know PM&R can be very cush - q14, one weekend per 3months, home call, etc. depending on program - (of course, there are harder and easier programs - but as a whole, the call schedule tends to be easier)
ER is nice too - shift work - about four-five 10-12hr shifts per week. No call.
Anesthesia after intern year can also be nice. (after the SICU ICU rotations)
Derm is definitely good - after intern year
Bigger programs at community hospitals tend to be easier than academic institutions.
How about a medical informatics residency??