Woody, are you familiar with the arrivals area at Heraklion Airport? As you emerge from the baggage collection area into the small hall where most of the car hire desks are located, there are usually loads of reps holding up cards with names/companies etc, so chances are there should be someone with a Goldcar notice waiting for you. But if not, head for the pedestrian gate on to the main road, straight in front of you, and walk to your right where you should find the bus. In the worst case scenario you can walk on down that road to the Goldcar office, as it's located near the cargo sheds opposite the end of the runway. However, as Warwick suggests, I would give them a call to confirm arrangements, especially if you are arriving at a busy time of day.