Liability of kids playground/swings

[Abraham Anderson]

I'd love to add a park/playground to my 20 (now 21 unit) property, (as there are several families there with young children), but I am worried about liability issues. I am thinking something like swings, a slide, etc. Is there a way to do this while legally protecting myself from liability (i.e. having them sign a waiver)?

Here's a photo of the area

(please ignore the bricks/construction items, they were there temporarily during renovations and are being removed).