On Labour Day, the Istana opened its doors to about 15,000 members of the public, between 8.30am to 6pm.
President Tony Tan Keng Yam and his wife Mary were first welcomed with a performance by Malay traditional percussion band NADI Singapura.
This was followed by a dance and 'cheerobics' performance by the NTUC Club U-Live for 'active aging' seniors aged 55 and up.
They were also treated to a performance by the River Valley High School concert band.
Members of the public could also see Falabella miniature horses from the Singapore Zoo, take a guided tour of the Istana Building, or go on a nature walk to spot kingfishers, hornbills, trees and plants on the Istana grounds.