I did that once. It is very cool.
It's much more controlled in the USA though, to protect the turtles. Park rangers or trained volunteer turtle patrols find the turtles. The public participants wait in the park office, watch a video about the turtles, and then we just sit and wait until they find a turtle. We aren't allowed to go until she's already dug her nest and started laying. No lights except small red flashlights are allowed. Once she was done laying, we got to help cover the nest better, and mark it off.
The mosquitoes were gawdawful though. I was dressed head to toe, dousing myself with bug spray every 5 minutes, and still got over 60 bites, everywhere fabric touched my skin and they could bite through.

