Playa Manzalina is one of the places I want to visit and checkout when we go on our trip to Curacao. This beach is on the West side of the island. Here's my research below:

Playa Manzalina Curacao Map:

It was hard to find a good video on YouTube, but here's one with really unstable footage.

Playa Manzalina Curacao Videos:

This video shows both Manzalina and the neighboring beach of Playa Shon Mosa:

This video says Playa San Juan, but based on the footage it is actually Playa Manzalina.