Istana, the official official for the President of Singapore as well as the Prime Minister. Free entry for Singaporeans and PRs. $2 for foreigners. An additional of $2 to visit the state building is well worth it plus all the funds goes to charity too. Large patches of grassland and greeneries which are well-maintain with various events going on. Worth a visit and it is open 5 times a year to public.
Rolling hills are not something you find in Singapore. Coupled with a huge fountain and stunning garden, it is perhaps one of the most refreshing sights in Singapore. The istana is only open to the public during certain public holidays and is rarely accessible otherwise.