If you’re photographing people at the beach as a portrait and it’s bright you’ll find that they will almost always have shadows on their face (often cast by hats, glasses, noses etc). Switch on your flash and force it to fire when shooting in these situations and you’ll find the shadows eliminated and your actual subject is well exposed. This is particularly important when shooting into the sun when without a flash you could end up with your subject being at some stage of becoming a silhouette). If your camera gives you some level of control over how strong a flash to fire you might want to experiment with this also as firing a full strength can leave your subjects looking washed out and artificial. If your subjects do look overexposed and you cant decrease the flash strength try moving back a little from your subject and using your zoom to get a tighter framing as this will decrease the impact of the flash. As usual - experimenting is the key.

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