While some prefer to build their own tracks, a Hot Wheels enthusiast from Holland gained access to a closed waterpark. Said enthusiast also owns one of those Hot Wheels cars made to hold a GoPro:
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The enthusiast then set up a number of races in the slide, along with the GoPro car in the final position…
…and got surprisingly good footage:
Here’s footage you can full-screen:
When Mattel released the limited-run GoPro-compatible Hot Wheels car in 2018, they ran about $1 each. Now that they’re discontinued, they’re like $20 from resellers.
Source: core77