Puerto Rico has really good roads and highways that make it easy to travel around the island. However, you will miss a lot if if keep driving only these main roads. There is a road through the mountains that connects the west and east coast of the island. It's called Ruta Panoramica (or Panoramic Route in English). Sometimes smooth and sometimes a bit bumpy. Sometimes pretty narrow, but still safe enough for two cars passing each other. Sometimes in the middle of the rainforest and sometimes on the top of the hills.⠀
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It's called panoramic because the views are amazing. Like this one. There is also one spot from which you can see the Atlantic Ocean looking north and Caribbean See looking south. We didn't do the whole route, but started near Adjuntas and drove all the ways to the east (with one sleepover, because we stopped the hikes and views like this one).
Photo taken on my iPhone 5S and edited in Lightroom.
Place: Ruta Panoramica, Puerto Rico