We have often seen seaweed at BSV in April. Usually I wake up to one of Yolanda's guys raking the beach. He collects bags of it. (I think it usually washes up during the night) He starts very early! By 6/before 6? I have to say I didn't see him this trip but perhaps that was because I slept in most mornings? Not sure. We have also seen iguanas hiding under the seaweed on the beach there.