Although you won't find any discounts at the national parks, most museums and other attractions around Central America do offer discounts for students. It always pays to ask.
You'd be wise to arm yourself with an International Student Identity Card (ISIC), which offers substantial savings on rail passes, plane tickets, and entrance fees. It also provides you with basic health and life insurance and a 24-hour help line. The card is available for $22 (£11) from STA Travel (tel. 800/781-4040; www.sta.com), the biggest student travel agency in the world. If you're no longer a student but are still under 26, you can get an International Youth Travel Card (IYTC) for the same price from the same people, which entitles you to some discounts (but not on museum admissions).
Travel CUTS (tel. 800/667-2887 or 416/614-2887; www.travelcuts.com) offers similar services for both Canadians and U.S. residents. Irish students should turn to USIT (tel. 01/602-1600; www.usitnow.ie).
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.