You seem to have your heart set on Zakynthos but I have to say it’s not a good use of time for a sort-of overrated payoff. Your time is much better spent (in my opinion) seeing another Greek island in the cyclades (maybe taking a ferry to Naxos or Paros sitting outside on the deck drinking a bottle of wine) rather than taking a bus and connecting flights. Zakynthos and Santorini/Mykonos are on opposite sides of the country and the only way from one to the other is by flying (or some combination of bus and ferry). So, my recommendation is to consider spending those Zakynthos days in Naxos, Paros, Milos, or some other Cycladic island.
Hawaii’s biggest island has everything you could ever want to do and more. But what separates it from the other islands is Volcano National Park. Explore volcanoes, climb through old lava tubes, and watch as new lava oozes into the ocean. Then there are all the waterfalls on the island, too. Big Island has it all. I mean it’s Hawaii — how could you go wrong?!
Yachts moor in the deep, sheltered harbour of Vathy, or Kioni, a miniature port where you’ll find Spavento, the perfect pier-side café-bar. Go any time of day or night for ice-cream sundaes, excellent cocktails, and a soundtrack to make your heart sing. Ideal for low-key family holidays or retreats, rugged little Ithaca is somewhere you can still disappear.