See those rays out of light streaming down through the clouds - curative properties for sure. If you really can't get to the ocean, a lovely lake can suffice until you can make your way to the coastal ends of the country. I can attest to the effectiveness of that also.
I know, you think it's hard to schlep the kids on and off the beach, not to mention the organizing, packing up, and driving. But, I guarantee that it will be worth each little grain of sand that ends up in your car and other unspeakable crevices :)