Boka Hulu is one of the places I want to visit and checkout when we go on our trip to Curacao. Here's my research below:

Boka Hulu, Caracao Map:

Boka Hulu, Caracao Video:

You can't access this beach from the roads as it is gated. I did read an article that said you can hike from the Blue Room Cave. It's recommended to bring a lot of water.

https://curacao.for91days.com/boka-pos-spanjo-and-boka-hulu/