Picture yourself sitting in a comfortable lounge chair on a warm Sacramento afternoon. You're surrounded by cool water, but you aren't completely submerged. The kids are swimming a few feet away, an umbrella provides some shade, and gentle bubblers send water across the shallow surface around you. You haven't checked into a resort. You're sitting on the sun shelf in your own backyard pool. Sun shelves have become a popular feature in custom swimming pool design because they c