He was shriveled, smiling and a 94-year-old volunteer. He sat on a stool by a makeshift information cart with maps of Botany Bay. He and his wife met at Valpariso and now he “catches the fish and she cooks them up.”   I was alone. He told me, “This is too beautiful a place to not bring someone with you.”  He was right-Botany Bay Plantation and Edisto Island ARE gorgeous and somewhat exotic.       At the southernmost tip of Edisto Island, you will find the Botany Bay Plantation Heritage and Wildlife Management Area and the secluded Botany Bay Beach.     The approach to Botany Bay Plantation is…