Delos Island is accessible by daily ferries from Mykonos. The WHS takes up half of the area of the island, so to see it all means a lot of walking. In the middle of the island is a museum containing statues and artifacts found on the island, one of the bvest in Greece.
In antiquity Delos was a consular city, where governments around the Mediterranean, and as far away as Syria, sent representatives to resolve disputes, arrange trade etc.
The residents obviously enjoyed a high degree of comfort, judging from the size of their houses, the amenities and entertainment available.