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