Palmar refers to a palm grove or a place abundant with palm trees. While 'palma' (palm) is common, 'palmar' is a more specific and evocative term for the natural setting.
In "Playa Sola," the singer is alone on a beach, and he sings to "la brisa y al palmar" (the breeze and the palm grove). This word paints a vivid picture of his isolated, natural surroundings, highlighting the solitude and the beauty of his environment as he expresses his longing.
In "Playa Sola" (Lonely Beach), Lalo Mora sings about being all alone by the sea, with just his canoe, guitar, and a fishing net for company. He's really missing someone special and spends his nights singing to the breeze and the palm trees, and to the moon that lights up his sadness.
He's hoping that "el gran Señor" (the great Lord) will remember him so he can leave this lonely beach and be reunited with his love. He even calls out, "¡Chiquita! ¿Cuándo vendrás a dormir? Necesito verte" (Sweetheart! When will you come to sleep? I need to see you). It's a heartfelt song about longing and loneliness, wishing for his love to return.