Þingvellir's information center has a basic cafe (tel. 482-2660; Apr-Oct daily 8:30am-8pm; Nov-Mar Sat-Sun 9am-5pm). At Geysir, the Geysir Center has a workable cafeteria (tel. 480-6800; June-Aug daily 9am-10pm, May-Sept daily 9am-8pm, Oct-Apr daily 10am-4pm) and the Hotel Geysir has a much better restaurant (main courses 2,200kr-3,700kr/£$35-$59/£18-£30). Gullfoss has Gullfoss Kaffi (tel. 486-6500; Mon-Fri 9am-6pm; Sat-Sun 9am-7pm), suitable for light meals.
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.