It's worth detouring 11km off Rte 61 to hunt out Heydalur, tucked away at the head of Mjóifjörður. Here cabins cluster around a converted barn, the campground stretches beside the river, and indoor and outdoor hot-pots and a geothermal pool are dotted around. The restaurant (mains 1800kr to 3600kr; open 10am to 9pm June to August) serves hearty food.
Local activities include guided horse riding (per hour 8000kr), and kayaking (per two hours 7000kr).