What's a good ground cover for a steep hill?

I just moved into a house with a very steep hill in the back yard. Rather than risk cutting off my feet with a lawnmower trying to keep it trimmed, I'd like to replace the grass with a no-mowing-needed ground cover?

I'm in central New England, so I need something hardy. Also, it's near a swimming pool, so something bare-foot freindly would be best (juniper is right out!)Any suggestions would be great!