Sentosa Island – Singapore’s fourth largest island is located just half a kilometer from mainland Singapore and is accessible by foot, car, cable car or monorail. With rainforests, sandy beaches, water parks and the S.E.A. Aquarium which features over 100,000 marine animals, there’s plenty to keep the entire family occupied. For something off the beaten track, visit rustic Pulau Ubin, an island that is often considered the last village in Singapore, and spend the day cycling through coconut palms and mangroves.