From French Canada to the California coast, from the Greek islands to newly united Germany: Those are some of the destinations for hiking and biking trips by American Youth Hostels Discovery Tours.

Trips are rated from beginners to experienced, and are available for teens (ages 15-18), young adults (ages 17-25), adults (ages 18 and over) and those 50 and older.

For a copy of the 24-page AYH Discovery Tours Catalog, write American Youth Hostels, Dept. 860, P.O. Box 37613, Washington, D.C. 20013-7613, or telephone (202) 783-6161.