National Parks (NParks) recently launched 3 more DIY nature walking trail guides of 3 locations in Singapore. They are as follows:
Fort Canning: A Guide to the Trees of The Fort
Changi Village: A Guide to Heritage Trees at Changi
Pulau Ubin: A Guide to Pulau Ubin Tree trail
Plenty of things to look out for especially heritage trees. So if nature is your cup of coffee/tea or if you are planning a shopping cum nature trip in Singapore, do print out one of the above brochures by NParks.