Each semester my school had a different focus.
Geriatrics (Community, Nursing Home, LTC Hospital), Medicine, Surgery, Operating Room, Ambulatory Care, Obstetrics, Psych, Community/Public Health, Family, & Choice.
We also were able to have a couple of days of shadow time in a more specialty area in each clinical semester. During surgery we went to the OR for a couple of days, during medicine we went to ICU, during OB we went to L&D.
In OB we had one day in L&D, if you saw a birth, you were lucky! We were told that L&D was for experienced mat-child nurses, so it was more for exposure, rather than for us to participate in the birth.
In the OR, I was there just for observation since it was only a couple of shifts. In Ambulatory care it was only a few shifts too, but I could assist a little more with putting out trays, dressings, and assessments.
For my preceptorship, I'm going to the ER where I will be paired with an RN and follow her through everything she does (including codes, traumas, and the minor things) and eventually be able to participate as much as possible.
The hospital we did our clinicals at was a small community hospital, so opportunities were pretty limited. No clinical time for me in peds, neuro, oncology, burns, etc.