If you will travel Singapore for adventure without tourist guide I will recommend Singapore City Hop-on Hop-off tour. In a glimpse you will know more about Singapore. Just devote 2hours for the City and Heritage tour ( 1hour each ) and almost all of the helpful information will be discover either with live commentator or with pre-recorded information. Good thing you can choose what place you want to visit within 24 hours but just be reminded that Hop-on Hop-off bus tours will end 6pm. Another suggestion to visitors to buy combo tickets to avail discounted rates, try Singapore flyer, Night Safari and Hop-on Hop-off tours and bigger discounts awaits compare to buying the ticket separately. Me and my partner had fun on our trip to Singapore and Hop-on Hop-off tour helped us a lot. Many thanks and more power!