The Crescent Trail is the longest trail in Perinton (with maybe an exception for the canal trail). It stretches for approximately 35 miles from one end of Perinton to the other. Chances are if you’re hiking in the Fairport / Perinton area you’re on a section of the Crescent trail or one of the connected loops.
You should never head out on the trail without a map. Perinton provides a great trailmap for the Crescent Trail which you can print yourself or just carry on your digital device. Here are the two sections available: