This one is a postcard. YSY A is late, as usual ("nos conocen por ser los que más tardan", they know us for being the ones who take the longest), riding a "lancha" (a small motorboat) through streets that are "como en Venecia las cuadra'" (like the blocks in Venice). That sounds like the Tigre delta outside Buenos Aires, where boats are the buses. And what he loves most is simple: "tu cara viendo cómo pega el sol sobre el agua" (your face watching how the sun hits the water).
That image is basically the whole chorus, repeated until it feels like a lazy afternoon. The verses sneak in more: skin that tells him things, "lo mío por los míos viene" (what's mine comes for my people), and a promise, "pase lo que pase yo voy a regresar" (whatever happens, I'm coming back). By night the sun is gone and it gets more physical, but he keeps steering back to that face on the water.