HOW TO SPOT A RIP CURRENT:

IT'S WHERE THE WATER LOOKS EASIEST AND SAFEST, with no waves breaking or rolling in.

NEVER ENTER THE SEA HERE.

If you get caught in a rip, DON'T FIGHT IT. You can't swim back to shore against it; you will become exhausted and drown.

Instead, SWIM ACROSS IT, parallel to shore. You'll soon be out of the current and can then easily swim back.

Boost, please, and make sure your friends and family know this when they hit the beach.

@marcas
I am pretty sure that some of the things at the water edge are people. Zoom in and you can make out legs.