Chase the Chill
The Open-Flame Option
The glass-enclosed fireplace in the newly redesigned lobby of the Royalton hotel is double-sided, so twice as many people can get closer to the flames (44 W. 44th St., nr. Sixth Ave.; 212-869-4400).
Shared Body Heat
On Monday nights, Lafayette Grill becomes tango central, with lessons followed by dancing until 1 a.m.; watching the pros outdo each other is worth the $10 cover (lessons, $5 per person with Ensueño Tango Salon; 54 Franklin St., at Cortlandt Alley; 212-732-5600).
The Community Shvitz
Wall Street Bath & Spa is clean, not too crowded, and has a deep cold plunge, salty seltzer from Russia, a lap pool, a cigar room, a billiard room, a restaurant, and big-bellied men strutting around in flip-flops (it’s co-ed) ($32.50 for the Old American Shvitz; 88 Fulton St., nr. William St.; 212-766-8600).
Once unwrapped, these card-size adhesive warmers radiate for several hours. Attach one to a chilled extremity, or fold it in half and carry it in your pocket (99 cents at JAS Mart, 35 St. Marks Pl., nr. Second Ave.; 212-420-6370).