For adventurers with limited funds, you might consider the other option of leaving with only a few tickets. If you have a long list of interests, sellable skills, minimal ties back home, prior travel experience, maturity, and enough money to get started, you may not want a set itinerary, so you can wander as your interests change, and just come home, or find work as you need. See the September 1993 issue. Most US and Canadian libraries carry this. Prices may have changed since then.
Overseas orders are surely more.