Winter habitat hike
Jan. 12, 2 p.m.-3 p.m., Merkle Wildlife Sanctuary and Visitor's Center, 11704 Fenno Road, Upper Marlboro, Prince George's County. Learn about hibernation and the various ways that native animals survive in the winter. Wear warm clothing and comfortable hiking shoes. Free. Contact: Karen Jarboe, 301-888-1377, email@example.com.
Casual family biking
Jan. 12, 10 a.m.-1 p.m., Patapsco Valley State Park, Avalon area, 5120 South St., Halethorpe, Baltimore County. Meet at the Lost Lake parking lot to begin your trip and make your own pace along the Grist Mill Trail. A ranger will be at the trail entrance. For all ages. Water will be available. Call 410-461-5005 to sign up or for more information. No fee. Donations welcome.
Jan. 21. Scuba instructor John Kiser will explain how to become a certified diver and will discuss local dive sites. The 7:30p.m. meeting is presented by the Broadneck/Magothy River MSSA Chapter 10. Site: American Legion Post 175, 832 Manhattan Beach Road, Severna Park. Doors open at 7 p.m. Free and open to the public. Information: 410 913-9043.
Polar Bear Plunge
Jan. 26. 17th annual Maryland State Police Polar Bear Plunge at Sandy Point State Park. Benefits Special Olympics Maryland. Information: plungemd.com.
Md. Half Marathon
Registration is open for the fifth annual Maryland Half Marathon to benefit the University of Maryland Marlene and Stewart Greenebaum Cancer Center. The race will be May 11 in the Maple Lawn community of Howard County. The cost of registration will be $75 until Jan. 31, $85 in February and $90 from March 1 to May 11. The cost of the Dozer's Kids Fun Run is $15. Register at mdhalfmarathon.com.
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