This guide is designed to alert readers to the scope and variety of programming coming up. Listing is not meant to represent blanket endorsement since not all of the programs will be of interest to all viewers. Readers are urged to be selective. FRIDAY Leo & Liz in Beverly Hills (CBS, 8:30-9 p.m.): Premi`ere of new sitcom with Harvey Korman and Valerie Perrine as a self-made couple struggling to fit in among Beverly Hills opulence. SATURDAY
American Film Institute Tribute to Billy Wilder (NBC, 9:30-11 p.m.): Scenes from movies and tributes to one of Hollywood's legendary directors.
A Prairie Home Companion (PBS, 9-11 p.m.): Humorist Garrison Keillor, host and creator of the American Public Radio program, brings his whimsy to television in a special featuring the favorite elements of the radio show. SUNDAY
Robin Hood (ABC, 7-9 p.m.): ``The Disney Sunday Movie'' presents the 1973 animated classic.
Masked Monkeys (PBS, 8-9 p.m.): ``Nature'' examines African forest primates from Kibale, Uganda.
Forever Wild (PBS, 10-11 p.m.): Centennial celebration of the New York State Forest Preserve, narrated by Richard Kiley.
Resting Place (CBS, 9-11 p.m.): John Lithgow stars as an officer assigned to bury a black Vietnam veteran in a white-only cemetery. MONDAY
Texas 150: A Celebration (ABC, 9-11 p.m.): A salute to the Lone Star State by such performers as Gene Autry, Johnny Cash, Mack Davis, and Ginger Rogers. Lots more, too.
Elephant Games (PBS, 10:30-11 p.m.): One of the most spectacular sporting events in the world: a rodeo for domesticated elephants in northeast Thailand. TUESDAY
A New York Philharmonic Celebration with Zubin Mehta (PBS, 8-10 p.m.): ``Live From Lincoln Center'' presents a gala concert featuring Montserrat Caball'e, Isaac Stern, and Itzhak Perlman.
Trade War: A Short Course on the Tokyo Summit (PBS, 10-11 p.m.): A beginner's guide to the May 5 economic summit's major topics -- international trade and protectionism. WEDNESDAY
West 57th (CBS, 8-9 p.m.): Return of CBS News's disco-beat magazine show with stories from Bolivia and Indianapolis, among others.
Cathedral (PBS, 8-9 p.m.): Based on the David Macauley book, this live action/animated family show tells the story of cathedrals and the life and culture surrounding them. THURSDAY
Bridges to Cross (CBS, 9-10 p.m.): Premi`ere of new series starring Suzanne Pleshette and Nicolas Surovy as rival reporters.
Agatha Christie's Partners in Crime (PBS, 9-10 p.m.): ``The Ambassador's Boot'' is premi`ere of five-part series featuring a 1920s husband-and-wife detective team. Check local listings for all PBS programs since local stations' option often results in differing schedules.