Zakynthos is one of few Greek islands and currently one of the most popular tourist destinations in Greece. We have been there on holiday last year at May, temperature were between 25 °C to
35 °C in midday, it's awesome place and we had a marvelous time!
Must see places if you consider to go there are Shipwreck (Navagio), Blue Caves, Zakynthos town it's even not possible to call all those places which you could visit. We rent quad for 25 €, to fill up a gas tank we paid 10 €, it's enough to go around the island. You can buy cheap map, if you plan to go around with quad better buy more detailed map, we bought ours for 1 € and it wasn't good, because some roads were missing from the map, wohooo. We got lost only once, it happened when we were going back from Shipwreck, it was great experience and in the same time breathtaking journey, this adventure was amazing!