Switzerland
Switzerland is a world-class winter playground. Nothing can beat the Alps for skiing, snowshoeing and hiking. Adelboden and Lenk resorts are ideal for beginners, while Andermatt attracts more serious skiers. Mountaineering, climbing and anything to do with mountains is Switzerland's specialty. Resorts in the mountains usually offer everything visitors need, from equipment rental to spas, indoor fitness and live entertainment.
Greece
If you would rather spend your time on the water, Greece offers dozens of islands, ferry connections, water sports and tours. Between June and September, the waters around the Ionian Islands are especially popular with water enthusiasts. Crete and Macedonia-Thrace, on the other hand, are popular diving destinations, while the north offers access to rapids that can be navigated via rafts and kayaks (this is not a place for beginners, though, as the waters are rough). If water is not your thing, hiking is big in the Peloponnese and the Cyclades islands.
Romania
What Switzerland does for winter mountain sports, Romania does for summers. Home to the Carpathian Mountains, Romania is big on horse riding, which can be done privately or with a guided tour that will take you through cannons, hills and forests. Transylvania, in particular, has a dense forest surrounding it and is ideal for both horse riding and hiking. In fact, if hiking is your thing, you shouldn't miss trekking up the a rocky peak that leads to Bran Castle, better known as Dracula's Castle. For those who want a different kind of adventure, the Bran-Moeciu area is popular with mountain bikers.