I was reading your helpful post. Have you travelled on the Alexander. Is it like the other passenger catamarans? Is it likely that passengers will be sick?
Are threre any other boats that go there?
When are you going? There are several agencies that arrange for day cruises to Delos/Mykonos.
Bear in mind it's a long trip which will take up most of the day. We did the trip in Oct. so it appears there may be trips available that far into the off-season. During High Season you'll have no problems.
Delos, for me was far better and a more enjoyable and educational experience than Mykonos. Delos is a one of Greece's most sacred areas with no one allowed to live on the island. It's one of the best and least visited of Greece's archeological sites with wonders everywhere you go.
Mykonos, while visually stunning was over-the-top touristy and crowded, even for October. There were three huge cruise ships spewing out hundreds, if not thousands of tourists making the waterfront so crowded you couldn't walk a straight line. You will have to go uphill and away from the waterfront to get a more "Greek" experience with classic Cyclades architecture and far less people because of the steepness of the streets. Multi-million dollar yachts in the harbor will explain why Mykonos is one of the most heavily touristed & expensive of the Greek Islands.
If that's your thing you'll love it . . . if not just try to find areas that aren't crowded (hard to do).
The trip to the islands was during a very sunny and mild day with calm waters . . . however there were a couple of elderly passengers that got seasick. If that's an issue you may want to bring along a sea-sickeness pill.Edited: 20 August 2018, 23:28