Ocotal Beach is only 5 minutes from Playa del Coco. This area is great for snorkeling and fishing. The sand is volcanic thus the dark color. There is a restaurant located there that is great for sunsets. Mainly housing in the area, but it is also a nice beach to just spend the day and hang out.
We can provide you with transportation there. Specially for those staying at Riu Guanacaste or Riu Palace.