For boys and girls aged 13-18, Austravel has opened a "Teen Camp Down Under," a 25-day tour covering attractions from Australia's Great Barrier Reef to New Zealand's scenic mountains. Campers will have the opportunity to go on wilderness treks in the Outback, join ecotours conducted by qualified naturalists and join in sailing, horseback riding and rock climbing, under the supervision of specialists. The trip is priced at $3,965 per camper and includes round-trip airfare from Los Angeles. Departures are on June 28, July 2 and July 6. Call (800) 633-3404.