Songjiang University Arena has a full size, Olympic size hockey rink. It's open daily from 9.30am-10pm, and it's 60rmb for 2 hours (skates included). They often organize games there, so it's a good idea to call ahead to see if the ice is free. Lessons for kids are organized by a third party hockey club, about 180rmb for one hour. Uni students get in for free.