You can see a few cranes in breeding pens here but the real attraction is the Crane Observation Centre (8.30am to 4.30pm November to March), a winter feeding ground that is your best chance to see cranes outside of a bird park. Inside there are lots of interesting photos and some fun exhibits.
The bus from Kushiro Station to Akanko Onsen stops here (?1450, 1? hours), or follow Rte 240 between Kushiro and Akanko.