Leave Conil by going along the beach right to the end of the alarmingly eroded cliffs. Then rise to the top of the cliff along a path. At the top at Puerto Conil you have to cross a river and go past an anchor graveyard. Then along the top of the cliff into the village of Roche. At the restaurant Timon de Roche (v. posh, but forgiving of sandy boots) descend down the alley to the beach. 8kms later you will be in Sancti Petri, having gone past some large new hotels. Staying at the beachfront Hostal Campanario.
Birdwatch pause: Plovers, Cattle Egret, Lesser Egret, Stonechats, Hoopoes, Red-legged Stilts, Flamingoes, Lesser Kestrels, and two unidentifiable squeaky ones.