For proximity and diversity, the Red Sea is hard to beat. Here, the Oberoi at Sahl Hasheesh has its own house reef, explorable through snorkelling, scuba diving and night dives. After a day under the Egyptian sun, repair to a warren of cool white buildings, crafted to resemble the architecture of the region with domed roofs and pillared entrances.
The Oberoi, 117 Sahl Hasheesh, Red Sea, Egypt (00 20 65 3440 777; oberoihotels.com). Doubles from €268, room only. Diving from £475 (£50).