Rotations are the best (and maybe the only) opportunity you have to explore different aspects of the profession. Try to get the most variety. Try to go off the beaten path. Go to Indian Health Service, go to world-class cancer centers, go to small county hospitals, go to major Pharma company, go to a PBM, go to nuclear pharmacy, do an academic rotation or a management one - don't limit yourself to something you think you are comfortable with, nor to something you think you want to do (though it's certainly a good idea to spend a couple rotations in that area). Explore your options, you may change your mind. And simply have good time - you have the rest of your career to do what you think you want to do - so get the variety. That's the best advice I can give you.
My favorite rotations were as wildly different as a rural pharmacy in the middle of nowhwere, a major PBM, an Indian Health Service and an ICU service.