More low-cost and free travel ideas >> Buy trip cancellation insurance if you think a health or personal problem will interfere with your travel schedule. Premiums starts at about $4 per $100 of coverage. >> Cruise lines generally offer free passage to anyone who can recruit 10 to 15 paying passengers. You can also cruise free as an expert on a subject suitable for a lecture series. There is demand for ornithologists, historians, and experts on the culture of the country of a cruise ship's destination. Free cruises are also available to doctors and nurses willing to be on call 24 hours a day. >> To stay for free in Las Vegas or Atlantic City, bring $3,000 cash with you. The hotel or casino will keep this money in their safe and, in return, give you a room free.