If you decide to take the ferry to Spain you will be able to drive your own car making it a much more leisurely journey as babies and toddlers will not be confined to an airplane seat and can crawl or walk around while you travel to your destination. This is a more expensive trip and takes 36 hours. When you arrive you can drive to the popular holiday destinations but this will take quite some time. Instead, you could opt for a holiday on the Costa Verde in Northern Spain.