Bukit Timah Nature Reserve offers an opportunity for some hilly trail running a mere 12 km from the city. The 163-hectare preserve is primary rain forest, with a wonderful variety of fauna & flora, and lush vegetation. There’s a good variety of trails for running. The reserve features a dairy farm, nature park, quarries, and Singapore’s largest hill at 163m. NOTE: walking/running is not permitted the designated trails for mountain biking.
This trail map has good information on the trail distances, features, and level of difficulty. The easiest trail for running is the 4.5 km Wallace Trail. The 11 km Scenic Quarries Trail is a more challenging option. For some hills, take the trail to the 163m summit of Bukit Timah Hill, which also features the ‘Summit Steps’.
Add-On: The Rail Corridor Trail passes through the western edge of the Preserve. Can add on by running south along the Rail Corridor Trail, which connects to the Clementi Forest & Pandan River Trail.