Bombing halt in Vietnam; Mar-a-Lago becoming part of National Park Service; Lady Bird describes china for Preservation & Restoration luncheon; Lady Bird names speakers & guests; press are invited to speeches; Lady Bird gives remarks & introduces speakers; upcoming Bicentennial year; tours of White House; Lady Bird rests & makes phone calls; visit with LBJ & Harry McPherson; Lady Bird visits with Texas visitors; LBJ park; visit with Lynda Robb; Lady Bird bowls; dinner; LBJ talks with ministers about youth