"Start from the top (no pun intended)—what are we looking at here? Cueva Ventana is a cave atop a limestone cliff in the mountainous town of Arecibo about an hour from San Juan. Its name translates to "Cave Window:" One hikes up and looks through for a gorgeous view of mountains and river. For the adventurous types who love nature, this is a must-visit. Got it. Is it easy to get around? Hiking the cave requires a moderate fitness level, so this isn't recommended for anyone with mobility issues. Any tips before we plan a visit? Head over on a weekday, when non-resident tickets are $19 for a 90-minute guided tour." - Alicia Kennedy
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