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How about this, let kids play and self manage their play time. 
If the kid runs up the slide and gets hit, they’ll probably stop on their own. If they are bothering other kids, let the group sort it out. >

OP has strong get off my lawn energy >

Anyone is welcome into my yard and can even play on my playground... So long as they don't climb up the GD slide >

I use to run up slides because there was no line and I saw the other kids do it, I thought it was cool since the cooler/older kids did it. Though, it's kinda strange looking back onto it. >

People with kids are the most entitled in my opinion. They will constantly use the excuse of being a parent to as an excuse for many things