Is it OK to exercise the day before rhinoplasty?

Exercise is considered a healthy activity (when not carried to extremes!).  Yes, after any real surgical procedure, for a time  (days or sometimes weeks) it is important not to overly stress one's body, and to not elevate  blood pressure & heart rate in order to avoid problems. But exercising prior to a procedure should be fine assuming it is a level of activity that one is accustomed to and no dehydration results.  If exercise just prior to a procedure is relaxing and calming, it may actually be a very good thing. But there should also be adequate time to "cool down"  and remain hydrated afterwards so one's body returns to a normal resting state prior to receiving anesthetic drugs and undergoing surgery. Remember that before sedation or general anesthesia, there is an "NPO" (no foods/drinks) time period which your surgeon will order for you. 

There would have no negative effect upon your surgery, except you would be fasting and unable to drink to rehydrate so this would be the only issue I could see. May be better just to relax.