Very nice country. Clean and Discipline people that includes the tourist (or you pay the corresponding fine). A lot of theme park for the entire family or for couples. Different hotels from average to 5 star. Cab driver are nice and very accomodating.
I am right now at Singapore for past 10 days..its an amazing place... Any one can travel alone here...its safe and clean... so many tourist attraction...like Santosa island,Marina by the bay,Sinagpore zoo...and there are many attractions in these... Only thing is you get tanned here so wear sunscreen..and it rains any tym..so be prepared ...:) Other than that its like a paradise...:)
Is it safe to visit and travel Singapore for 2 girls together without any family member or any boys?
I would say bring your light clothes as Singapore is known for its humid weather. It takes about a few days to tour around the city/attraction places. Shopping malls are everywhere. Hopefully to see you here when your visiting the city.
Avoid travelling at peak hours (8am - 10am and 6pm - 7:30pm) via MRT. It gets super crowded and you might not board the train even after missing 3 trains. However, should you need to still travel, the good news is, Singapore MRT train frequency is about every 3 - 6 mins. The bad news is, you will be squeezing flesh to flesh with the crowd.