Check out the cave

The cave looks dark but for some unexplained reason you are drawn to it.

Carefully you venture inside not knowing what to expect. Once again you wish you were wearing more than your little string bikini as you see some light at the end of the tunnel and hear some water flowing.

As you step out into the light you see that the cave has opened up into a large lagoon complete with a waterfall. The area is completely surrounded by sheer walls but the top is open letting the bright sunlight shine into the blue water.

"Nice." you say to yourself as you look into the refreshing water.

A glance around the large chamber seems to confirm that you are alone.

The water looks so inviting as you test it with your toe. The temperature is perfect as you consider going for a swim completely unaware that a set of eyes is watching you from beneath the water's surface.

You....

decide to take a dip, turn around and head out of the cave or ????