I've now been up and down the caribbean coast of Costa Rica and I can confidently say that the most photogenic place is the Gandoca Reserve near Manzanillo. Here I finally got some caribbean vibes, which I was missing the previous four weeks. The other beaches up north are nice, don't get me wrong. But they are not as photogenic as what you find here.

Wild caribbean beach of Manzanillo at Puerto Viejo, Costa Rica