The park is definitely the better workout, because the uneven surface also makes you work out all the small muscles you need to keep your balance. People who run 5 miles on a treadmill often get tired after 2 in the park. Best to run on the grass if you can though.
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Hmm I'd recommend against treadmills if you can find a good park. Less boring, easier to stay focused, breath of fresh air, better for the knees.
The park is definitely the better workout, because the uneven surface also makes you work out all the small muscles you need to keep your balance. People who run 5 miles on a treadmill often get tired after 2 in the park. Best to run on the grass if you can though.