Experiencing ancient rainforest in Malaysia usually means planning a lengthy excursion from the capital, Kuala Lumpur: be it a drive to the Taman Negara national park, in the centre of the peninsular, or a flight to Langkawi or to the states of Sarawak and Sabah, on the island of Borneo. But on a recent visit, I am let in on a secret: Janda Baik, an eco-destination surrounded by tropical rainforest and less than an hour’s drive from the skyscrap…