The back of the FDC has 2 stamps to complete the registered mail postage. The stamp on the left is part of the 2009 Flora and Fauna Definitives set issued last May 6, 2009 which depicts the Pigeon Orchid flower. The second stamp is part of the 2007 Flora and Fauna Definitives set issued last June 6, 2007 which depicts the Crimson Sunbird.
The stamps inside:
The brochure with information regarding Kent Ridge Park Trail: