V.W.
What's a splash pad? LOL
If you are referring to a pool, yes, we have one and the kids don't get bored with it until the last month of summer every year. And then, it wasn't until maybe this year that that happened (so, the 7th summer?)...
If a splash pad is NOT a pool.... then I've got no clue. But anything short of a pool, I would think would get really old, really quick.