When you had enough of the beach, you should definitely jump in your car to discover more of the island. We started by exploring the North during a day road-trip to the Shipwreck viewpoint. This was the longest trip as we almost crossed the entire island. Even so, we still managed to squeeze a bit of beach time in the late afternoon. Other activities can be done on less than a half day as the distances are relatively short and many points of interest, including Zante town, are located in the Southern part of the island. Here is a list with fun family activities in Zakynthos:
Travel Tales and Teddy Bears 