Stångehuvud is the pink-granite knob that closes the western end of Lysekil, sloping straight into the Skagerrak. The rock is unusually smooth, sculpted by glaciers, and the surface is patterned with shallow round basins called jättegrytor (giant's kettles), drilled by sand and meltwater during the last ice age. There are no buildings — only a network of marked paths winding between rock domes, juniper, and small wind-bent pines.
Walks here range from a 30-minute loop close to the road to a full circuit of the headland (about 90 minutes) with several places where you can scramble down to the water. On warm days locals swim from the granite slabs and lie out to dry. The reserve is open year-round and free.