I will be in Ibiza for July as well. The club season opens in June and closes in September -- so July will be fine. Don't go nuts trying to plan everything, however here are some nights that you just can't miss....
--- Big Nights Out ---
1. Sundays at Space -- if you have energy left over then the carry on party at DC-10 Monday morning
2. Wednesdays: Subliminal/Underwater at Pacha
3. Thursdays at Amnesia when Paul Van Dyk spins
4. Any club/any day when Danny Tenaglia spins
The other nights you can choose depending on your music preference.