The curiosity was very intense that driving me crazy. Where would that trail lead to? I found a little clue on this nice website.
You can see his great efforts to draw the trails map. I guess if I went on(from Summit road), I would have found the hidden secret treasure of AQUEDUCTS and moving towards the Ship restaurant in Batu Ferrighi.
Just a little bit of history from http://www.pht.org.my/http%3A/%252Fwww.pht.org.my/article/heritage_water_works
An appreciation of Penang’s history is integral to understanding the importance of heritage. For example, one of the reasons why early mariners stopped at Penang was to replenish their supplies of fresh water. Batu Ferringhi (Foreigners’ Rock) with its waterfall once visible from the sea was one such source for sailing ships to obtain water before and after crossing the Indian Ocean. Near the current E&O Hotel on the north shore was a later site -- known as Sweet Water Bay and depicted in early paintings -- the terminus of an aqueduct from the Waterfall behind the present Botanic Gardens. That waterfall and the reservoir at its base are the site of the oldest water works in Malaysia and should be regarded as a heritage site.
Other early reservoirs and aqueducts also deserve designation as heritage sites. In particular, the picturesque Guillemard Reservoir at Mount Erskine built in 1929 under the supervision of Penang’s first municipal water engineer J.D. Fettes is not only a functioning example of early 20th century engineering but a site of outstanding beauty that was a popular venue for pre-war picnics before it was closed to the public. The Guillemard Reservoir is part of a public water supply system designed by Fettes that includes a four-mile-long aqueduct built in 1926-1929 winding through the hills above Batu Ferringhi. Fed by three intakes from hillside jungle streams, this historic aqueduct leads to a mile-long tunnel and a 24-inch cast-iron pipeline ending at the Guillemard Reservoir.
Should Penang hill and other hills be disturbed for its water catchment purpose? I'm not a strong environment activist and I have no strong opinion on this but water security has always been an issue for Penangnites.
Meanwhile, with totally busted knees, I'm planning how to best conquer this trail # 9. Have a nice weekend. :)