Discounts for seniors are available at almost all of Kauai's major attractions, and occasionally at hotels and restaurants. Always inquire when you make hotel reservations, and especially when you buy your airline ticket -- most major domestic airlines offer senior discounts.
Members of the AARP (formerly the American Association of Retired Persons; tel. 800/424-3410 or 202/434-2277; www.aarp.org) are usually eligible for such discounts; AARP also puts together organized tour packages at moderate rates.
Some great, low-cost trips to Hawaii are offered to people 55 and older through Elderhostel, 75 Federal St., Boston, MA 02110 (tel. 617/426-8056; www.elderhostel.org), a nonprofit group that arranges travel and study programs around the world. You can obtain a complete catalog of offerings by writing to Elderhostel, P.O. Box 1959, Wakefield, MA 01880-5959.