We should put this in the sticky somewhere.
I think there are two schools of thought about 4th year, either you do a lot of fun rotations and take a lot of vacation, or you take rotations that will hopefully make your internship easier.
First, plan to schedule the first few months of 4th year as away rotations in EM or EM electives at programs you are interested in. Rotating in July, August, and September gives you enough time to get a letter in for applications and gives you a chance to see how people learn EM outside your institution. Unless you are a lazy ass, outside rotations are almost always a positive.
Then what to do with all those elective months? Well, it is unlikely that you will have time to get any letters from them if you follow my advice above, and it is unlikely that the grades will appear on your application at ERAS time, so I wouldn't worry too much about doing a stellar MICU month or whatever. I would recommend doing a month that is very liberal with vacation or a vacation month in December or January to provide ample time for interviews. Realistically the most interviews you can do is 3 a week so you need a good bit of time to get them done.
So now you have used up about 4 months of the year, what's left to do? Personally I advocate doing rotations in all the things you are interested in that you will never get to do again, or addressing any personal skill deficiencies that you have. I did NICU, MICU, Rads, Gas, and some research months. Other interesting rotations would include Path, ortho, optho, etc.
If you are concerned about being able to "hack it" during your ICU month as a resident then it may be helpful to do an ICU rotation as a "fourthie." Personally I think it makes little difference but friends of mine said that they felt a whole lot better as residents with some ICU time already under their belt.
In short, have a good time, it's the last time you won't have to "work" constantly so make the most of it.
Seaglass- OUT!