Rich
Concerning buses, try
www.cretetravel.com/Bus_schedules/Chania_Rethymno.htmRethymno - Plakias: [3,10 euros]
06.15, 08.15, 10.15, 14.15, 16.30, 19.30
Saturday & Sunday: 08.15, 10.15, 14.15, 16.30, 19.30
Plakias - Rethymno: [3,10 euros]
07.00, 09.30, 12.15, 15.00, 18.00, 20.30
Saturday & Sunday: 09.30, 12.15, 15.00, 18.00, 20.30
I don't know if this is for this years time table though. Journey takes about any hour .... Greek time.