If you are in Cadaques during summer and would like to splash in the water and sunbath for a while there is a quite a small peeble beach ( all the beaches in Cadaques have peebles ) named Sa Conca. Once you are in the centre of Cadaques at the seafront just go all the way to the left around the coast. ( You can either go walking or by car, it's not more than 1km. anyway )You'll be passing beside the "Jane beach" ( which is also small but probably quite crowded during summer ).
If you find a juction always take the path on the left and you will finally end in Sa Conca beach. It is still one of the most quiet beaches of Cadaques during summertime. It is not as close as the other beaches but it's certainly worth the walk. There is a Scuba Diving School in there as well. Whatever choice you make enjoy this little jewel of the Mediterranean that Cadaques is. My favorite place in the Costa Brava.