Start your day by visiting the Singapore Zoo and see a variety of animals such as orangutans, tigers, and elephants. Then, head to the River Safari and take a boat ride to see the wildlife along the river. In the afternoon, visit the Bukit Timah Nature Reserve and hike to the summit of Bukit Timah Hill, the highest point in Singapore. End your day by visiting the MacRitchie Reservoir and enjoy a peaceful walk along the boardwalk.