Clayton Snyder, who graduated in June from Lock Haven University, participated in a study abroad program, spending February to June in South Korea.   Snyder, a senior recreation management major with a concentration in environmental/international studies, had received a $4,000 Benjamin A. Gilman International Scholarship to study in South Korea. The son of Bob and Kim Snyder of Lebanon, Snyder is a 2008 graduate of Cedar Crest High School.   In South Korea, he attended Chungnam National University in Daejon, where he studied the Korean language and culture.   The Gilman International Scholarship Program is sponsored by the U.S. Department of State, Bureau of Educational and Cultural Affairs and is administered by the Institute of International Education. Recipients are chosen by a competitive selection process.