You can stop at Can Tixedo, just before Salines to get to Es Cavallet. It involves a bit of a walk but very easy to reach from there.
Thats what I do , normally . Walk along the beach and through the official ways in the dunes , if there is no parking spot at csvallet. Think at a bottle of water . Where is the bus stop at salinas ? Close to Hostal Salinas ? Never saw a bus there .