Weather and conditions permitting, the standard route is Falling Waters/Bridle Path loop over Lafayette with a stop at Greenleaf. Bridle Path is very slippery in places though...so be aware.
IIRC it is about 8 miles and something like 4,500 vertical of climbing, so it is not for the weary. And it will be busy, but the views are amazing.
If you don't feel like hiking, a Tram Ride is also a good bet.