I have been coming to Ibiza since I was 9, and every year I go I still manage to find new places that I love.
One of my favorite places to visit is Ibiza Old Town (Eivissa), the shopping here is amazing :) beautiful cobbled streets with white building and great restaurant or bars.
This time round we went to new Thai restaurant called "Thai'd up" which is at the the very end of the harbor, The family who own it are from the UK they were so friendly and we had a great night with them, they visit Thailand every year, so their understanding of traditional Thai food was way up there :) If any one goes there get the Khao Soi or Khao Soy soup, it was delicious!
Another great little find was a a place called Roco Verd in San Jose
the food here was also excellent, I had a prawn salad warp and my boyfriend has chili beef wrap,
There is a cute little bar right out the front you can see from the main road but behind this huge old olive tree there is a secret court yard where you can dine under a veranda of vines and trees.
Putting the the whole party view of Ibiza aside, there are lots really nice places you can find. We just got a car out for the day and drove to any remote spots and we always came across some really rustic quiet areas, which haven't been hit by the young tourist yet.