There are many different activities that one can do free of charge. For example, there is a great deal to see and enjoy within your state or city. There may be an art gallery, museum, lake to swim in, and other places like those where you could spend the day having fun for no cost at all.
In general, beaches are also a great place to spend the day. The warmth of the sun and the feel of a cool breeze on your skin is exhilarating. But, sometimes, swimming in an ocean or lake can be dangerous, so it would be wise to take precautions.
For free activities in Singapore, other places that one could visit include many parks throughout a city or town, historical landmarks such as old buildings from previous centuries, and some churches.
Some other things that one can do include taking a walk, picnicking outside on sunny days, biking along trails or bike paths in your area, getting together with friends for coffee or tea, and simply talking.
There are also plenty of things that you could buy at no cost to enjoy, such as reading books from the library, watching movies either by renting or borrowing them from someone and checking out books on CD for free.
In conclusion, there are many things that one can do to pass the time for free.