PALM HARBOR — Susan Adams is a bit of a pioneer. When Lake St. George Elementary opened in 1988, she became one of the school’s first teachers. In her 46 years with Pinellas County Schools, she has never been afraid to try something new. Now, after nearly five decades in the classroom, she is retiring. This year — her last — marked Adams’ first teaching second grade. Through a practice called looping, she moved up with many of the students she had taught the year before.