Princeton, New Jersey (United States of America) - "Mountain Lakes Trail Run & Walk". A 5K+ trail run and 3K walk at Billy Johnson Mountain Lakes Nature Preserve. 5K+ trail run and walk comprising about 10% paved park trail, 30% unimproved service right-of-ways and 60% single track including moderately technical rocks, roots, logs, and whatever else nature has wrought in the woods. Walk is approximately 3K, includes paved park trail, service right-of-ways, easy single track. There is a creek crossing over stepping stones. Due to the technical nature of the trail run, parents should consider whether the run event is appropriate for young children. www.princetonac.org/events/mountain-lakes-trail-run-and-walk