Ibiza, end of season parties begin at the end of September, you would have a fantastic time I'm sure of it. All the big named DJ's are out there, my sister is there now (23) and she got talking to Pete Tong the other day! All the celebs (known on the circuit for their clubbin!) usually head out there too. Must stay in San Antonio, it's the livliest bit of Ibiza. It has warm weather that isn't too hot, I see spain is about 34� at the mo so it will probably be in its late 20�s. It isn't the sh!thole that everyone says either, Faliraki this year was buzzing even though it got such bad press last year (which was definitely too hyped up) but I think that will be dead by the end of September. Try going to your local travel agents and ask them what they think. You don't have to buy a holiday just because you go in to talk to them! Be prepared to pay top dollar for drinks if you go to the big clubs in Ibiza though. Es Paradis and the likes charge about �6 for a bottle of water!