We’re currently updating our roundup of the best ice-skating rinks in the city and we’re sorry to say that two spots that were just unveiled last season won’t be back. Although the websites for the American Museum of Natural History’s Polar Rink—which featured a recyclable synthetic surface in lieu of ice—and Seaport Ice have not been updated with this info, the folks answering the phone confirm that neither rink will reopen this year. Thankfully stalwarts such as Rock Center, Wollman and Chelsea Piers aren’t going anywhere!