FORD HOLIDAY BOAT CAROLING: School,  church,  company and civic choral groups sing traditional carols on cruising boats. Evenings Nov. 29-Dec. 23 on the River Walk,  210-227-4262. Free for spectators;  $125-$150 for participating groups. Photo: EDWARD A. ORNELAS, SAN ANTONIO EXPRESS-NEWS / eaornelas@express-news.net