White-water rafting, sailing cruises, team-building exercises--Renunion '98 was full of fun and excitement. This year's event, from June 4 through June 7, featured outdoor activities like the Class of '78 and class of '93 rafting trips in Northern Maine. Several other classes trekked to the coast for boat excursions and island hopping. Back on campus, there was a book signing by Colby authors, an Outward Bound session and, of course, a Parade of Classes.     Anne O'Hanian Szostak '72 received a Distinguished Alumna Award and long-time Colby alumni secretary Sid Farr '55 was honored with the Marriner Distinguished Service Award.     Plan already are under way for Reunion '99.