First Day Hike. Explore one of Thacher Park's most popular trails past frozen waterfalls, pine and hemlock forests in a winter wonderland hike! Total distance is approximately 2 miles. Registration required. Call 518-872-0800. 10 a.m. at Thacher State Park Visitor Center

What’s Going on Inside of Me? Little Edisons read the book My Outside: An Independent Mind in a Dependent Body (by Sara Pyszka and Corrie Legge) and learn about what’s underneath our skin. Then students learn about the heart, lungs, and digestive system and make a model to take home. Jan 4 to Jan 7. Cost $40. Classes will start from 9 a.m. to 4 p.m. at the Museum of Innovation & Science 15 Museum Dr, Schenectady, 12308 

Full Moon Wolf Walk. Celebrate the Wolf Moon with a short illuminated walk in the woods of the Woestyne. Cost $10 and, free for members.  Registration is required at  schenectadyhistorical.org/event/wolfmoon. 5 p.m. at Mabee Farm Historic Site 1100 Main Street Rotterdam Junction, 12150

Bethlehem Chamber Polar Bear’s Name. Hamlet will debut for photo opportunities at First Night. Alyssa Bercharlie of Selkik, will receive a $25 gift card to Romo’s Pizza and Restaurant in Glenmont. between 6 and 7:30 p.m. at Four Corners Luncheontte 2 Grove St. Delmar 12054.

All Aboard! Celebrate the Museum’s annual Model Trains Show! Dec. 26, through Dec. 30, Cost $40. Classes will start from 9 a.m. to 4 p.m. at the Museum of Innovation & Science 15 Museum Dr, Schenectady, 12308 

Winter Scavenger Hunt. Join an educator as we learn about winter wildlife on a guided scavenger hunt! We’ll walk short, easy trails around the Visitor Center if the weather is good and move indoors if not. Recommended for ages 12 and under. Call 518-872-0800 to register. 1 p.m. at Thacher State Park Visitor Center 

First Night Bethlehem.  Celebrate the Season in The Town of Bethlehem. from 6 to 7 p.m. at Delmar Four Corner 2 Grove St, Delmar, 12054,

Winter Wonderland. We are inviting the community to stroll through our halls to attend our free family-friendly inaugural Winter Wonderland. 7 p.m. at Krumkill Road, 334 Krumkill Rd. Slingerlands, 12159

G. B. H. Solomon Saratoga National Cemetery - Wreaths Across America. Wreath laying will begin at 10:30, no earlier. Each cemetery section has been assigned section leaders. Our thanks to the Patriot Guard Riders, Wreaths Across America Ceremony at 12 p.m. at Gerald B. H. Solomon Saratoga National Cemetery 200 Duell Rd, Schuylerville, 12871

December 19th Meeting. Please bring a Holiday treat to share and a childhood Christmas memory to offer in a brief program entitled,  Postcards from our Childhood. 7 p.m. at Bishop Scully Hall in Delanson.  1735 Alexander Road Delanson, 12053