From the center of the esplanade, to the front door of PPH, using the little shortcut through GCH, it's about .44 mile, using mapmyrun.com.
The shortcut means that you go into DTD, then directly after Sephora (on the left) you turn in the big gates to GCH. Follow the path around, go in the sliding glass doors, follow the indoors path, get to the lobby. Turn right to go out the pretty (and big) sliding main doors of GCH, go along the sidewalk along the driveway, cross the street, and go to PPH.
You can actually cheat by a few yards and go in the door that you'll see after you pass the big windows that look into (or out of, depending on where you are, LOL) PCH Grill, instead of walking the rest of the way to the main doors. But if you've never seen PPH you might as well go in the lobby.
If you don't want to cut through the GCH, you just walk all the way through DTD, point yourself towards DLH, then turn left before you get to the grounds. Walk along the path and you'll see PPH, and you'll end up entering the side-ish of that building, and then you can find your way to the hotel.
The GCH path is more pleasant for me.