Limestone secrets
Fort Snelling State Park
Noon-1 p.m. Friday
• Rocks and minerals deposited during the glacial period reveal area history. See how humans, too, changed the landscape. (612-725-2724; mndnr.gov/fortsnelling)
Candlelight outings
Luce Line State Trail
5-8 p.m. Friday
• A milelong trail for walkers will be alight with candles. Stay for campfires and refreshments. Park off Vicksburg Lane. (651-231-6968; mndnr.gov/luceline)
Lake Carlos State Park
6-9 p.m. Saturday