You mean this sign halfway up Heart Attack Hill, just besides a vandalised tree? I walk or bike past it quite often and I'm glad to live close to a designated eco-route.
But you're right, it's just a "green" campaign by the Conservation Association and those pretty signs are paid for by HK Electric, their sponsor. But their free Lamma eco-tours at least help to increase awareness amongst locals and all the families and nature lovers from all over HK walking these tours learn a lot from the very knowledgeable and well-trained volunteer eco-guides.
The signs tell all Lamma visitors a bit more about our nature, including the challenges it faces, so I wouldn't knock them too much. There are dozens of them all over North and South Lamma, even in quite remote locations and I like stopping and reading them. A lot better than no info at all.
As the local powers-that-be and politicians don't have anything comparable to offer to tourists, besides building human and dog toilets, pavilions and sitting-out areas all over the island, I welcome these signs. The locations might be a bit unfortunate sometimes, but the visitors reading them wouldn't know about the history of the locations.
The
Lamma Eco-Tour map is still the very best free tourist map of Lamma, even though it's a bit hard to find in print (budget ran out after the initial print run).
Online version.