This experience can be enhanced in many ways most of which are only limited by the imagination of the parent.

A sand pit is an essential part of any childhood. Many children develop their social skills in just such an environment, first playing alongside other kids but not interacting and eventually cooperating to develop complex cities and structures.
The sand pit could be as simple as a plastic shell or 4 sleepers screwed together. It could be built into a larger playground complex. A sand pit built into a deck may have the option of being closed in at a later date when it is no longer needed.
Providing a cover for a sand pit is essential if there are cats in your area or else the opportunistic feline will thank you for an oversized litter tray.

If the sandpit is part of a more permanent structure, consider the effect of roots from any nearby trees. They will make themselves at home in the sand. A layer of plastic sheet will slow down the invasion, though you will need to provide some drainage points

Swings are another important aspect of a children’s play ground. They provide great aerobic activity as well as general strength and coordination.
If you made a considerable effort to install a swing, yet you child doesn’t seem to get it, don’t despair. Keep pushing them. It will help keep you fit and is a great opportunity to talk to this wonderful, developing creature. One day the whole swing thing will suddenly click. Then you won’t be able to get them off it.

Off-the-shelf steel framed swings are a good cheap option. They can be put into action quickly and relocated with little effort. If you are handy with tools, a timber framed swing looks good. Just be sure to provide some form of diagonal bracing. The force of the swinging action can be projected up to the joints, loosening bolts or screws and resulting in a nasty accident.

Children love secret locations, hidey holes and tunnels. While they are very young you will need to keep an eye on them. As they grow older visual contact is not so necessary as long as they can hear you call when it is time for dinner. By choosing plants that will grow with the child you can provide them with just the right amount of privacy all the time.

There are many other components of a playground. Climbing frames, ladders and poles may be added to a well designed playground as its users grow.
A trampoline is fun for all ages.
The most important thing to provide them with when they are young is your company. If you just send them out to the playground, they will wander back in to be with you. Push them on the swing, dig some sand or make up a story about what they are doing.

Your time with your child in the garden is a great investment in their future. Besides, it’s lots of fun.