The peninsulas of Halkidiki, a prefecture of Greece, resemble a three-fingered hand. Kassandra, the westernmost peninsula, is renowned for its unspoilt natural beauty, its numerous sublime beaches and rippling Mediterranean forests are ripe for exploration and mountain-biking. Luxury travellers will also adore trying out the geothermal springs, like the thermal spa at the five-star Miraggio resort. Popular with families, Sithonia is the central peninsula and much like Kassandra, you'll find a wealth of beaches -- almost 100 of them -- with gold and white sands and clear, warm waters. Of particular note are Orange Beach, Karidi Beach, and Kavourotypes, said to be the Sithonia's most beautiful beaches. This peninsula is also ideal for fans of scuba diving, snorkelling, and other water-based sports and activities. Mount Athos is the easternmost peninsula with stunning monasteries that teeter on mountainsides. If you do want to visit the island in person, access to the area requires special permission in advance, and entrance to this monastic community is only permitted to men. However, the best way to see Mount Athos is from the water, take a boat where you can watch dolphins skim the waters, and see the landscape of the peninsula unfold.