Creston Museum is a small but useful introduction to the valley. Its exhibits cover the town's railway links, farming, forestry, mining, and the local quirks that come from living in a mountain valley close to both Kootenay Lake and the American border.
It is not a major museum, but it helps make sense of the orchards, irrigation, time-zone oddities, and settlement history you see around town. Pair it with the wildlife area if you have a half day in Creston.