Khasab is a good place for a swim. Bassa Beach is a walk away from the ferry terminal but has a lovely sandy beach with palm umbrellas (and toilets). Wild camping is permissible here, and beautiful shells often wash up at the tent flaps when the weather is rough. Follow the road from the port towards Bukha for 2km or so.
Don’t be alarmed by the 1.8m sharks that often circle in the shallow bays near Khasab – apparently they’re not interested in human flesh.