Hi Susan and welcome,
Never seen the ferry so full that foot passengers were turned away.
As you have a car, if you check with the rental company you could take the car with you and explore more of the island. You might then need to book tickets for August.
Have a great holiday.
Thanks Bob. Ideally we'd like to take the car and stay over night so that we can explore at our leisure. However, there's a lot to consider - car hire and whether taking car to Ithaca is permitted, ferry booking, hotel booking. Just trying to decide what best to do and when.
Most companies are happy for you to take the car to Ithaca providing you ask first. You would only need to book the ferry the day before. For hotel you would just have to turn up and hope. There is a tourist info place in Vathi.