Our backyard has a hill that we use frequently with a slip 'n slide in the summer and for sledding in the winter. But, it does not compare with the hills at Borden Park in Rochester Hills. The entire park is surrounded by huge hills to keep it secluded from the surrounding main roads.  Anyway, it makes for some fun sledding. We've seen other kids there, and lots of sled tracks, too, but fortunately, it's never been too crowded.  There's lot of sledding ground to be had! The hills might not be big enough for adult thrills but it's perfect for kids under 10.