Dogs barking viciously.
Cars honking. (When crossing the street, when making an unprotected left, when falling asleep, when anything.)
Dogs whining or crying, from near or far.
What I thought were gunshots... but so did the Germans at breakfast I talked to. It turns out Ticos *love* fireworks for any and all celebrations.
And the sound I keep reacting to... the wind. The gusting, constant, terrifying wind. I am so surprised it can be such a large presence for someone, like me, who is not used to it. ¡Feliz fin de semana!