There are a few historic sights dotted around the islands and especially on Skiathos, where you'll find the deserted 14th-century town of Kastro. There are ruins of many houses and a church with some fantastic views across to the other islands. There's also a ruined Venetian fortress dating back to 1207.
In fact there are several atmospheric monasteries and churches dotted around the islands, but if you want to take a peek inside, remember that shorts, bikinis and sleeveless shirts are not allowed. If you fancy an alternative holiday , or maybe just some holiday well-being, head for Skyros, home to the Skyros Institute, a centre for holistic health and fitness.
With so many islands to choose from, it'd be a shame to stay on one beach for your entire holiday. There are hidden coves around every corner so hop on a boat for the day and explore. Lounge on tiny, deserted beaches, explore the fragrant pine forests and watch out for dolphins too.
If you're feeling energetic, head to the quiet island of Alonnisos for a ramble. There are numerous hiking trails and the ocean views are breathtaking.