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.
Holding the largest number of overwater bungalow resorts in the world (more than 75 and counting), the Maldives understands its best asset is the gin-clear, abundant waters of the Indian Ocean. When you’re not snorkeling, diving, or gazing at the rich marine life through the floor windows of your water-top villa, continue enjoying the underwater display while dining at 5.8 Undersea Restaurant, or even while getting pampered in Huvafen Fushi’s submerged spa.
Despite its legendary stature, the homeland of Homer's hero, Odysseus, remains surprisingly under-the-radar. Ithaca’s turquoise and emerald coves are popular with the sailing set, but few visitors venture into the forested hills. So, you might be the only person exploring dramatic hiking trails, like the heady trek to the church of Anogi, covered in 16th-century frescoes (ask for the key at the village coffee shop), or the 8th-century BC ruins of Odysseus’ palace. Do stop at Yefuri (facebook.com/Yefuri) on the way down, for thin pizza, fat chips, and its famous lemon tart.
I think it depends on where you live when it comes to expensive holidays, and what sort of accomodation you want. I’m from London and went to the Maldives in oct 2010 2 wks all Inc, £1150. Which was a bargin as previous years I been to Spain spending over £100 day on food and drink etc. I went to the addu atoll on the island of gan which is the most southern chain of islands. The hotel was everything I could have dreamed of, it wasn’t posh or extravergant but who cares when ya in the Maldives. Another great reason to go to the addu atoll is that when the British were there they built bridges and causeways connecting the south and west islands which means u can get on a bike and go and meet the locals, they were so friendly and I recomend the addu atoll to anyone !!!!!
The almighty church has kept nightlife in check. If you must see and be seen, head to quietly glamorous Astivi or Stoa bar, on miniature Agia Lesvias square, in Hora. Beach life is generally languid and low-key; Psili Ammos and Livadi Geranou are our favourite hideouts. Dinner reservations are essential at Benetos, for Med-Asian fusion on an organic farm, and Lambi for grilled fish on a purple pebble beach.