We did this as a family. The kids (7 and 9 years old) got the go karts that were rated about 40km/h and the adults got the carts rated at 70km/h.
I think in most countries the kids would not be able to drive such go karts due to insurance and liabilities, but in Koh Samui..... no problem.
I found the Go Karts very fast and challenging and after 10 minutes felt like I had run a marathon!
The kids loved it so much we returned the next day for another go. This time my 7 year old son had a fairly impressive crash into the tires (he got accelerator and brake confused), but wasn't seriously hurt as the safety tires and helmet did their jobs. He was shaken, but ok and I am glad they limited the kids to just the 40km/h go karts.
It wasn't cheap to do, but a lot of fun if you want a break from the sun, pool, beach, etc..
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