Attractive stone church built circa 1460 and extended in the late 18th century; Lutheran since the Reformation.
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Karleby hembygdsmuseum
Displays local rural life from the 19th century. There's a windmill, stable, workshop and forge, a smoke sauna, drying barn, cottage, tannery and carding works.
This is a small city block just south of the new church with four buildings around a grassy square with cafe. The four are Pedagogium the old school house, Lassander House showing life of a prosperous 18th-century family, the natural history collection, and the gem and mineral collection. The latter two (east side) are closed for rebuilding following a fire in Jan 2019.
Kokkolan kaupunginteatteri
The theatre has a regular programme of entertainment, but only in Finnish.
A charming little island with a lighthouse, an old church and a seal-hunting museum plus café; it used to be the base for sea pilots. The lighthouse, built 1889, is an automated steel tower, you can't go inside. The island's main buildings can be reached with strollers or wheelchairs from the jetty by boardwalk and decent track, but other paths (e.g., the nature trail) are rough going. The ferry MS Jenny makes regular trips June–Aug. It usually leaves at noon for a 90 min crossing, returning at 15:30 for 17:00. Trips sail June–Aug on W F Sa Su, plus late June to mid August on Thursday evenings and Tuesday noon. The boat sails from Meripuisto 2.5 km north of the centre, west bank of the creek (same side as the camp site). Bus 7 runs partway there but it's a pleasant 40-min walk from town centre, see "Do".