RE: Travel: Cycling to Cala Anguila, Mallorca
This beach Looks awesome ! Im definitely a bit jealous hehe
One way I found to deal with belongings is to bring one of these waterproof bags, don't know what they are called really, but they don't cost much.
So what you do is you dig a pit cover it up and then put your towels on top of it. Later when you leave just dig it up again.
As long as it's the middle of the day no grown up is gonna start digging like crazy on the beach and you will have time to see and catch the thief before they find your buried treasure hehe
Make sure the towels don't get blown away by the wind otherwise you might have to be digging there for a while heheh