Why don't you hire a car, you will be 25 mins from anywhere on the Island. If you don't drive take the water taxis which carry about 25 to 40 people aboard. You can't really get lost it's a lovely Island to drive on, really clean no half built areas in the middle of nowhere but olive & lemon groves. If your not confident & would like to travel in a group, then go with the reps, didn't take much notice but I'm sure they will do an Island tour either by coach or boat. If you are staying in a hotel see what trips other reps are doing also.

yep do it diy works out a dam sight cheaper

ie tui trips are 49.00/46.90/71.00/51.10

thats spirit of ibiza/just relax-formentera/ect

i know its nice to have things done for you.but if you drive or diy .you can stay as long as you wish... £33.00 for a trip thats costs really £10.00 if that.