Start off the new year with a guided family hike held at Cold Spring Harbor Fish Hatchery & Aquarium at 11 a.m. or 2 p.m. Monday. Learn about Long Island winter habitats.

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Preregistration required; cost is $4 for kids ages 3 to 12 and senior citizens ages 65 and older, and $6 for adults. Call 516-692-6768 or visit cshfishhatchery.org for more details or to register.

Cold Spring Harbor Fish Hatchery & Aquarium is at 1660 Route 25A in Cold Spring Harbor.