Arbuthnot Museum is Peterhead's local history museum, with collections tied to fishing, whaling, maritime life and the town's north-east Scottish identity. For a port town, that context matters: the harbour is not just scenery but the reason Peterhead exists as it does.
It is a compact stop, useful on a windy or wet day and worthwhile before walking the harbour area. Check current opening hours, as smaller Aberdeenshire museums may operate seasonally or on limited days.