The breathtaking coral reefs in the Maldives are on every scuba diver's bucket list. With ultra-luxe resort Cheval Blanc Randheli—on Noonu Atoll close to 30 known dive sites—and its PADI Dive Centre, you can take that dream one step further. This winter season, the resort's resident marine biologist, Sarah Kompatscher, will do guided dives (USD150 or $187 per hour) where you might also get to assist with data collection. Sexy!

If the scientist's life isn't for you, organize your own bespoke dive excursions (from USD136 or $170 for a single dive) with a dedicated dive butler. Each trip is customized, and you can choose your boat, be it a local dhoni or a sleek Azimuth yacht. Plus, you can hire the dive team's photographer and videographer (USD750 or $940 per hour) to document your underwater experiences.

There's plenty snorkelling activities as well, including sunset and night sessions, where you can gape at fluorescent plankton and changing coral colors. 

Room rates start from a rather steep USD1,300 ($1,616) per night (enquire with the resort for dive prices)—but the Tigerair flight to the Maldives (as low as $443) should help offset some of that. Visit the resort's website for more info.