What Serifos really needs is more ferries from Athens and more ferries to close islands. I was there last June (the tourism season had not started yet completely) and only a couple of ferries were running from Piraeus. I first went to Serifos and then wanted to go to Paros, but there was no direct ferry. This was very unconvenient, especially for a country like Greece which bases a lot of its economy on tourism. I think Serifos is only connected to Folegandros, Kythnos, Sifnos and maybe Milos.
Serifos is a wild island with very rocky landscape. Almost no greenery, except for some small green-yellow bushes. Most Cyclades islands are like this, aren't they? Beaches are not that great, very small and pebbled, but very quiet if you want to relax. I was surprised not to see a club on the island, maybe they hadn't opened yet in early June. Anyway, I was not that interested in clubbing so I didn't mind.
Except for Chora, there are no real villages in Serifos. The rest settlements have a few houses, gift shops, taverns and hotels. But Chora was very quaint and picturesque. It is built on a hill and gives nice views. If you are not swimming, spend you afternoon in the cafeterias of Chora drinking frappe (do not drink much of it, it is a strong coffee) and looking at the sea.