If you're interested in a more general specialty that would be considered a basic core rotation, who are the "go-to" attendings for LORs for that field, and at which hospitals do they work? Choose those sites for that rotation. Not a guarantee that you'll get those attendings, but it's a start.
Try to get some core ER and/or Radiology requirement in early before you do Surgery and Internal Medicine, if you can.
Any particular core rotation you are absolutely dreading or that makes you very nervous, whatever the reason may be? Don't put it first.
Some of the podunk smaller hospital sites away from the main university hospital might have more cush hours and a laid back vibe. Many of the classmates looking for shortcuts will keep this info on the DL and will obsessively base their whole schedules around this. But it could come at a heavy cost. You'll have to factor in the commute to those places (possibly less time for shelf studying) especially if you draw the unlucky hand of more anal-retentive residents or attendings that don't let you bounce at 3pm like the others. Your lecture education, chance to see cool rarer cases, and/or access to the best LORs/connections if you do surprisingly love the field could also be very limited. You'll need to weigh these factors as you make your choices.
Lastly, don't be afraid to do one of your highest choice specialties last (especially if it is a common core rotation that doesn't necessitate away rotation(s) to match). This inadvertently happened to me, and things worked out OK.