my gf suggested horse riding near cala boix but I think a meteor is more likely to land than me ever repeating that experience...
I looked into this but im too much of a fat bastard
On a more serious note, nearby beaches salinas (various fun chiringuitos) and sa caleta, if you have a car or deep enough pockets for taxis you can visit cala d'hort to view the mystical island of es vedra while eating lunch, or scramble down the nearby cliff to sa pedrera (aka atlantis).