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Observatory Trail Professional Review and Guide
"The Observatory Trail is one of only four National Recreation trails in San Diego County. You can walk it uphill, downhill, or both ways; but why not make it easy and have someone drop you off at Palomar Observatory and meet you later down at Observatory Campground? There are only 2 miles of paved road in between the two trailheads."
--Jerry Schad, Afoot & Afield: San Diego County (Wilderness Press).
my wife and I took our energetic 4 year old on her 1st hike and I must admit it was a little challenging for a 4 year old but she did it. It was a total of 4.4 miles roundtrip if you park at the campground and walk up. I wouldn't suggest this for someones 1st hike, too hilly.
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