As per my view, you want to visit unique place in short time which is little tough,but possible too. Because there are couple of places where you would enjoy with your family/friends/partner. I would like to recommend Sentosa in Singapore. I love this place where wonderful beach located. Malayisia is also good place, i am also planning to visit it in next month.
Go Straight to the 2 Casinos. Just kidding. Seriously. Seriously, you might be disappointed by the Singapore trip. Go watch Anthony Bourdain's Layover, Singapore episode, then watch his other episode and you can clearly see the lack of energy and enthusiasm while he was filming i Singapore.
Singapore is very beautiful city-state which has so many best places to visit. National Orchid Garden, Singapore Botanic Gardens, Flight Experience, Singapore Zoo, Marina Bay, Gardens By The Bay, Asian Civilisations Museum, Cookery Magic etc are best places in Singapore that people must have to see during trip.
Singapore is pretty good attraction in Asia basically it is an Island and measured as the smallest country. But its unique culture and outstanding beauty with lots of popular destinations attract tourist like Sentosa, Singapore Zoo, Universal Studios, Chinatown and Boat Quay are the main tourist’s attraction.