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These markers are found at most entrances and exits to the trail but along the trail there small orange triangles. Tons of them.
John Harvey Photo > John Harvey Photo - Hiking > Baden Powell Trail > Trail Marker
Trail to the Top of Mauna Kea
I believe the holes in the sign are so it won't blow over in the 60 kph+ winds.
John Harvey Photo > Trips out of the Country > The Big Island of Hawaii > Telescopes on Mauna Kea > Trail to the Top of Mauna Kea
Sign to Lost Lake
Would you have noticed the sign? The trail to lost lake is much less traveled
John Harvey Photo > Brothers Creek > Sign to Lost Lake