If your game isn't tight, the best way I've found is to make sure you're having fun not dependant on pulling girls.
You should go out with the mindset of making sure you have the best time you can possibly have and be genuinely excited about where you are and the music. Head out with this mindset and you'll naturally attract people, including girls.
Talk to and have fun with as many people as possible, not just girls. Also, normally you can't just go up and start dancing with a girl expecting to get anywhere without building some kind of rapport first, unless you're really good looking and exude a natural charm, especially in Ibiza where music comes first (in most places!). Queues and smoking areas are brilliant for meeting people. And don't be obvious in trying it on with multiple girls in front of each other. They hate that.
This has worked for me. Hope it helps!