It could come across as sounding like you dont want to work much. So hopefully, its not that.
EM - work hard when you're on, get 10-14 days off/month
IM - hospitalist - depends on the group, some work alot, others only work 1/2 the month.
ICU - typically work around 18 days per month, but those 18 days can be very rough, especially if you're the attending at a hospital with no residents (small hospital), you do ALL the lines, ect ....
Thats at the top of my head, I'm sure there's more. Plus dont forget that you can negotiate with almost any field on how much you work (and paid).