Sime Forest is part of the larger Central Water Catchment Nature Reserve. The forest is bounded by the golf courses of Singapore Island Country Club on both sides and the two reservoirs of MacRitchie and Upper Pierce. The old Sime Road runs through of the mature secondary and pocket of primary forests that complete a full circuit round the MacRitchie Reservoir by connecting network of walking trails.

Hikers, Joggers, Birdwatchers and Nature Lovers packed the forest on weekends as the National Parks Board built a treetop canopy boardwalk and lookout tower in the Reserve. Several parts of the forest have wooden boardwalk cut into the deep interiors.

This is the best place in Singapore for watching forest birds. Forest jewels such as the Red-crowned Barbet, Chestnut-breasted Malkoha, Asian Fairy Blue-bird, Banded Woodpecker, Purple-throated Sunbird, Blue-crowned Hanging Parrot, Thick-billed Green-pigeon, Orange-bellied Flowerpecker and Crimson Sunbird can be best observed from the top of the seven-storey high Jelutong Observation Tower.

Sime Forest has various access points, Drive in visitors have to park their vehicles at the Venus Drive carpark or the road end of Rifle Range Road, follow by a kilometre walk to Nparks Ranger Station or the Jelutong Tower. Walkers can used the MacRitchie Jogging Track.

EOA has experienced Bird Guides that enable to tell you every species of birds in the Sime Forest. The best time for forest birding is early morning between 0700 – 1000 hrs.