Windbreaks aren't just for blocking out the wind (though as the name suggests, they're very good at it) they're also an ideal way to add a little privacy to your camping setup. If you want to stop people peering into your tent, a windbreak can make a great privacy wall, as well as giving you somewhere to enjoy a drink without a gale blowing through.
If you're not much of a camper but you're heading to the beach with little ones, then a windbreak and a beach shelter make for a great bit of shelter and will have you set up for a day of sun and sand.