Ibiza - very attractive for young adults as it's very well known for it's night-life and it's night clubs. With many beaches to enjoy during the day where your more than likely to come across many water sports activities including: sailing, kayaking, diving, snorkelling and water skiing in the beautiful crystal clear Mediterranean sea, there are also many other sports such as golf, mountain biking and climbing (apart from Formentera which is a flat island), so you'll be spoilt for choice.
The two main locations to visit in Ibiza are Ibiza town and Port Des Torrent. Both are well known for the beautiful white sandy beaches which over look the beautiful clear sea (which is why going for a swim is compulsory).
Ibiza town is very well known for it's amazing marina which is home to many exclusive restaurants , shops, yachts and nightclubs which is why it's popular with the super rich. It is however popular for the tourists as it's also a very historic town, with sites such as the castle of Ibiza, which once you enter you see that it's made up of loads of little houses, which makes it so fashionable and popular but also because it situated in the hills and has views of the entire island. A privately owned villa in Ibiza town is the perfect get away from all the crowds which flood the streets of Ibiza during the day.
Port Des Torrent is known to be very crowed across the main beaches (as they are so beautiful) and in the centre of towns. Like Ibiza town, Port Des Torrent also has everything you want including the white sandy beaches and the amazing shops, restaurants, bars and night clubs. However because of the fact that it's not always busy everywhere you go and there are many water parks, golf courses and many places to try out some activities such as bungee jumping, go karting and paracending for the brave hearted. A short term rental apartment in Port des Torrent is a great way to see the island.
So this would be more of the more family or couple getaway from Ibiza town.