The Island: The original Themyscira - also known as Paradise Island - was founded three thousand years ago nearby Greece, and it was destroyed when Ares convinced Hercules to ransack and enslave the Amazons. They fought off their attackers and were given a new island, one that was cut off from mankind and protected by the Goddesses. That is the current day Themyscira. There are monuments and statues all over the island of the Greek Goddesses Athena, Artemis, Aphrodite, Demeter, and Hestia, although Artemis tends to be the one most beloved by the Amazons. The architecture is classical Greek, with columns and open spaces, even their own version of a Coliseum. The island is big and mostly made up of rain forest and wilderness, with native beasts that the Amazons hunt for their meals. All crops are naturally grown and gathered there. The Amazons are self-sufficient.
There are living quarters, bathhouses, feasting tables, and training rooms. They have many wild horses that are all trained by the Amazons that can be used at any time. The beaches have white sand and the waters are clear blue. They have a dock and ships there, since the Amazons do occasionally travel the world. They also catch fish. It is a beautiful and tranquil place. Men are not allowed and will be captured and most likely executed for being there. Some exceptions are made, but it's extremely rare.
There is a small island nearby called the Island of Healing, it is considered a safe place for injured parties to go, and this includes any men who wash on shore or get injured nearby. The Amazons do not wish them to die, it is simply that their laws are sacred on Themyscira. Male companions of visitors can stay on that smaller island to see them.
The Amazons: The Amazons themselves are the reincarnated souls of women who were slain by men, returned to this paradise to an immortal life. They can be killed but only in battle, otherwise they will live forever. The Amazons are trained to believe in virtue, love, and equality above all else. They are warriors and lethal in battle, all very skilled on horseback and with a variety of weapons. They all wear Bracelets of Submission, the metal that Diana has around her wrists, although only hers are bullet proof. They wear it as a reminder of what happened to them before, and to appreciate the life they have now. They wear traditional Greek clothing with togas and sandals, their hair in braids, and battle armor.
When an Amazon masters her training, she is given special armor designed with her own symbol, and a weapon forged the same way. There are new Amazons brought to the island regularly, either as reincarnated souls by the Goddesses, or female babies are saved by the Nereides and brought to the island and raised there. The Amazons do not hate men, but they do not understand them well either. They do not think in gendered terms, so something as simple as "policeman" makes them stare at you blankly. Gay relationships and marriage have always been celebrated there, and Amazons who choose to find a mate off the island and settle with him, that is fine too. She will give up her eternal life for it, but her sisters share her happiness. They believe in every woman having the life she wishes.
The Amazons speak in cultured and formal language, and they are skilled orators. They are honest and direct and very good at sharing. They have open hearts and kind souls. That being said, they are relentless warriors. They love adrenaline and adventure and settle their issues in a training ring. Float like a butterfly, sting like a bee is their way of being. Their sweet can turn sour easily once someone is an enemy or gives them cause to attack. They refer to all women as "sister," except if they are married in which case their loved one is by name or 'beloved.'
Things to do there: Horseback riding, any kind of weapon training you can think of, hand to hand combat, hunting, fishing, sailing, swimming, wrestling, sharing, hugging, eating, praying, and star watching at night. The stars are very bright from Themyscira since they can see the original Greek patterns of the stars.