Normally facing a playground is fine in term of FengShui. But this again depend on what you main door is directly facing. The price of houses that are facing playground is normally higher than those which are not.
However, having swings of the playground in front of your house and directly facing your main door have it negative influence in term of fengshui. Imagine whenever a swing is in use and moving, its motions represents a tiger opening its mouth. It is said to face a tiger’s mouth in such a way will experience poor health, accidents, bad luck and some time even death.
If your main door is facing more than one swing, then you know how many tigers that you are facing.
So what you can do about it? You do not need any expensive stuff; fengshui is always cheap and easily accessible if you know what to find. You can plant some trees just outside your house that will take on the impact of the swallowing movement of the tiger’s mouth. Please make sure you tend the trees of plants regularly.