I would get on the ibiza-spotlight.com forums, the ppl on there are very helpful. They are total Ibiza experts and can lead you in the right direction. I think it is pretty safe on the island, the locals will try to sell you things on the streets but that's it. We ended up hitching rides with some of the locals. But there are shady people on the island. We had a hard time catching a cab at one club and all these random ppl were trying to charge us ridiculous amounts of $$ for a ride to our hotel. Just stay with a group of ppl and use your best instinct. You'll run into a ton of f'ed up ppl. I got pickpocketed in Barcelona so be careful if you're going on the mainland. The attitudes of the crowds depends on the clubs you go to. I heard Manumission is cheesy. Don't miss Cocoon night at Amnesia, DC-10, the terrace @ Space, and Pacha. Also during the day, you should check Bora Bora in Playa den Bossa. It is a basically a big beach party with people dancin' like crazy. Also I would try to talk to the people at the clubs to find out about after hour parties. The highlight of my trip was an afterhours party with Sven Vath. It started at 8am and was on this secluded beach cove in the middle of nowhere. By 2pm, the beach was packed with Sven pounding out the beats. Richie Hawtin even stopped by for a visit!