A short list of "must do" things
1. Go to Ibiza Town during the day
2. Go to Ibiza Town at night
3. Watch the sunset over San An Bay
4. Get out and about to some of the quieter and secluded areas - Hire a car. Its no real hassle driving on the Island - Everywhere is no more than about 45 mins- 1 hour drive away.
5. If you want good restaurants get over to Santa Eulalia - some of the best on the Island
6. Enjoy your Holiday.
Remember - you are in a foriegn country - things happen differently to over here - take it in your stride as part of the experience.