Just south of Luling the vegetation grew more lush with semi-tropical plants. More swamps appeared the closer to Lousiana we drove. We camped at the Palmetto state park, named for the dwarf palmetto palms common in river bottoms around the gulf coast. The placid San Marcos River runs through the park but, about twice a year, it floods, and the campgrounds, which are on grounds over 50 feet above the river, are under over 4 feet of water. Hiking trails lead into the thick forest.