As summer approaches, you might like to take a dip (don’t forget the sunscreen). Appearing as if you are at the edge of a waterfall, an infinity pool offers a beautiful sight from within and without.

I was floating in the wide saline lagoon of the Grand Hyatt Kauai, drifting along on my back. Buoyed by the semi-salty water, I watched the palm fronds waving in the trade winds above me, silhouetted ...