Your playground may have a fence around the perimeter—you can provide that space to donors. If it’s a picket fence, donors can have their names printed on the slats. You can also sell bricks or other parts of the playground. Each level donated can correspond to a different size of the piece of fence or brick. For example, a $20 donation may get a donor one slat of the fence with their name or message while a $50 donation may get a donor an entire section of the fence to personalize with their name and/or message.
You’ll need to make it clear which donations yield which gift and keep track of what each donor wants printed. To keep donors interested while the playground is being built, consider setting up a blog, social channel page, and/or a regular newsletter to keep donors aware of when “their” fence is being built. You will need to hire a professional to engrave the names and messages on the fence or bricks, so when determining how much to charge per fence piece, you’ll need to factor in this cost.