Breakfast by the Odessa chuck wagon gang; brief Palm Sunday church service; Lady Bird plants a pinon tree; rafting trip down the Rio Grande; Lady Bird describes the terrain; training astronauts in Big Bend for the moon; fossil remains, including giant crocodile viewed; Lady Bird describes 139 people laughing, shrieking, joking and falling out of rafts; press women and Lady Bird all manned the paddles; box lunches; rain; dinner and music