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.
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These little coral islands are surrounded by excellent diving, snorkeling, and white sand beaches, and are filled with friendly locals. Private resorts litter the islands, and a vacation here is also very pricey. Luckily, Bangkok Airways offers cheap flights to and from Thailand. The best time to go to the Maldives is from November to May, when the weather is cool and dry. June through October sees wetter and hotter weather due to the monsoon season.