But Indonesia has more than just Bali. The nearby Gili Islands are another incredible island getaway. Both destinations make for a more active tropical vacation and the weather remains pretty constant all year round (though April to October sees slightly drier weather). Both Bali and the Gili Islands are close enough that you should be able to visit them both on your trip to really get the most out of this idyllic corner of the world.
Barbados is a vibrant island with a great nightlight. Bridgetown is one of the nightlife capitals of the area, so if you’re looking to stay up until the wee hours then this might be the island for you! Like Bermuda, you’ll find amazing beaches and caving here. You’ll also find some world-class surfing. The food here is amazing, and you’ll be able to enjoy expensive, delicious meals alongside cheap local food.
Question: Is it worth taking the evening ferry on the 4th Sep to Crete (Heraklion) from Santorini, then the bus onto Chania so that we can do the Samaria Gorge on the 5th? Spending the full day in Chania on the 6th and taking the last flight out of Chania that night back to Athens? (or do you think this is trying to squeeze in too much in too little time)?
Considering your interests (great food, hiking, beaches, nightlife unimportant) then Naxos should definitely be your other island. (And Naxos has many daily ferry connections with both Santorini and Athens.) Also, Athens needs at least one full day to explore so you should drop any thoughts about Delphi or Nafplio. Also, I would look into flights from Athens to Santorini on your night of arrival. If you could get to Santorini that night (and move your day in Athens to the end of your trip) you’d almost gain an entire day and could spend two nights on Naxos.