Lace up and get out there. LUTZ Polar Rink Opens What: New ice skating park fits 200 skaters and a seventeen-foot-tall stainless steel bear dressed in pine branches and sparkly lights. Why: Six to ten bucks includes rentals. No, you may not ride the Zamboni. When: Sat.-Feb. 28. Sun.-Thurs., noon-8 p.m.; Fri. & Sat., 11 a.m.-10 p.m. Where: American Museum of Natural History, Arthur Ross Terrace, CPW, at 79th St. (212-769-5200). SHOP Smith + Butler Opens What: Coveralls, bags, and uniform-inspired looks for the gents. A collection of vintage motorbikes and other relics for the ladies. Why: Add In God We Trust jewelry and Jenn Lady boots to your holiday wish list. When: Mon.-Sat., noon-8 p.m.; Sun., noon-6 p.m. Where: 225 Smith St., at Butler St., Carroll Gardens (917-977-1847). SHUCK Big Juicy Oysters What: At the helm of new UES eatery Flex Mussels is Canada’s champion oyster shucker, a salty crew from P.E.I., and mollusks prepared 23 ways (in absinthe, Guinness, Red Stripe, sake). Why: Pearls of wisdom come free at the bar. When: Your heart’s pumping for bivalves. Where: 174 E. 82nd St., b/t Lexington & Third Aves. (212-717-7772). SAVE Loden Dager Sample Sale What: Scottish cashmere sweaters, Sea Island cotton shirts, winter coats, jackets, trousers, and more. Why: It’s time to make that boy a man. (At least by appearance.) When: Thurs., noon-7 p.m. Where: 147 W. 29th St., b/t Sixth & Seventh Aves. Giles & Brother/Philip Crangi Sample Sale What: Jewelry seemingly rendered from relics and artifacts. Leather, chains, rhinestones, and silver. Why: It’s all cash and carry. So you won’t spend outside your means (unless you borrow from a friend). When: Thurs. & Fri., noon-7 p.m. Where: 147 W. 29th St., b/t Sixth & Seventh Aves., 2nd flr.