What should I do on the off chance this situation happens again?

A decade ago I was in the Caribbean. This girl was swimming near me and giving me looks, then kept looking at me on shore on the recliner and was acting like she was taking selfies, but was taking pictures of me. I could not think of an excuse to approach her and engage (what to say). Also wasn't sure if she spoke English.

It's still haunting me to this day, because I wonder what could have been. I started oggling her back and as I was leaving I wasn't even trying to hide it. She only smiled, but didn't engage and turned around.

On the off chance something like this happens again, how should I engage in a way that's not awkward.

What should I do on the off chance this situation happens again?
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