Even better... Take the bus from Honda to Omalos, overnight at the Kallergi  refuge,  a fantastic place to stay, they will give you an early breakfast, and then walk the gorge before the crowds arrive. There's no hurry,  catch the ferry back  to Hora  Shakira and the next bus back to Hania. It will be cheaper than  a organised trip,  more  enjoyable,  and a little adventure. Read the fine details in Rough  Guide  to  Crete