Formentera is populated by a large community of lizards/geckos, to the point that this tiny little reptile has become the symbol of the island.
They are cute, ladies will not be scared, and used to deal with people: they won't run away when you approach them!
We saw a lot of towers made of stones on the beaches and at Cap de Barbaria.
People say that if you express a wish while building your tower, your wish will come true when the wind will make the tower fall...
I don't know whether this is true, but I made a stone tower too... just in case! :)
Formentera is well known for its nudism, but there's plenty of people who keep their clothes on too - just go with whatever feels comfortable.
As an English person, I found it strange to begin with that there was so much flesh of all shapes, sizes and ages (even local teenagers would gather after school in groups and get naked on the beach for some late afternoon sunbathing).
In some places, you'll get segregated areas of nudism, and on Mitjorn beach there were no distinct rules but all the naturists seemed to sit together whereas those not so daring clustered together elsewhere.
If you join in, don't forget the factor 30!