Populonia Archaeological Museum is the perfect place to find out more about the city's prehistoric, Etruscan and Roman past. Following the coastline, there's a big number of bike and trekking paths which lead through the Mediterranean scrub towards Salivoli (with its modern port) and some family-run cellars open for visits and tastings. For instance, stop by the bay called Baia di Calamoresca for a tasty treat of grilled seafood and fish.
From Piombino, it's very easy to reach the Medieval village of Populonia with its castle and the tower from which you can admire a beautiful panorama. Moving towards the Baratti Gulf, don't miss the Archaeological Park of Baratti and Populonia where you can see the only necropolis built by the Etruscans near the sea. Its relics can be easily reached by following the marked paths.