Depending on your driving skills and your tolerance for large numbers of cars, RVs, and auto-towed trailers, there is no substitute for a self-driven tour of the park. Although roads are narrow, there are hundreds of turnouts that afford opportunities to take in the views. On the downside, the roads twist, turn, and change elevation frequently, so freeway speeds are out of the question.
For $45 a day, gadget fiends can rent dashboard-mounted GPS units with prerecorded audio keyed to locations in both Yellowstone and Grand Teton from GaperGuide, 145 W. Gill Ave., Jackson, WY 83001 (tel. 307/733-4626; www.gaperguide.com).
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.