The cafe at Jökulsárlón (June-Aug daily 9am-7pm; May 15-30 and Sept 1-15 daily 10am-5pm) has sandwiches, waffles, and decent seafood soup. Two accommodations listed above have good restaurants. Guesthouse Frost and Fire serve their set-dinner menu of fish (2,600kr/$42/£21) or lamb (2,800kr/$45/£22) to non-guests who reserve in advance. Smyrlabjörg's enormous dinner buffet -- with lamb, pork, chicken, beef, and no less than nine fish dishes -- is open to non-guests from 6 to 9pm, June through mid-September; the cost is 3,950kr and no reservations are necessary. In the off season Smyrlabjörg serves set dinner menus for 2,600kr ($42/£21), but only with a day's advance notice.
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.