If you're trying to go fast (or you don't dig bumping over roots every 10 feet), the best route (coming south) is to get off the trail at the big mall in LFP and head up Lake City Way (there's a full bus lane, so traffic isn't as much of a problem as you might imagine), then cut left on 30th (which quickly becomes 35th) and head due south, rejoining the BGT at U. Village. A bit hillier, but faster because it's straight and you don't have to share with joggers/dogwalkers/etc. This route skips all the LFP MUP stop signs.

[edited to add:] plus this lets you add a stop at the fiddler's inn for a brew before cruising the final bit back home. :-)