Vitamin D does wonders for our health. Better known as the "Sunshine Vitamin" because our bodies produce it from the sun's rays, Vitamin D regulates blood pressure, reduces muscle tension, and prevents cancer and various other diseases. Luckily for us, some of our favorite spa hotels have just the the right treatments. Whether they boast ocean-side cabanas or secluded rooftop hot tubs, these outdoor spas really know how to make us feel good -- all while we're soaking up the sun, of course.
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