Fitness executive Jim Worthington had one goal for the luxury trip he was planning to celebrate the birthday of his girlfriend, Kim Levins: privacy.

“I wanted to be 100 per cent away from everybody,” he says from his office in Pennsylvania, in the United States.

5 private islands in Southeast Asia you probably have not heard of … yet

“It was her 30th birthday, and I didn’t want to share it with anybody but her.”

So he booked the couple into Gladden Private Island, a tiny hotel off the coast of Belize that opened in December.

In an over­-connected world, seclusion has become even more of a benchmark of luxury

It consists of a single two-bedroom villa. The island “is less than an acre [less than half a hectare]. You could walk from one tip to the other, and it would take less than 30 seconds,” he says, laughing.

“It was like being Robinson Crusoe – you have no idea the staff [are] even there.”

He and Levins spent their days enjoying the solitude, sitting at the edge of the water for four or five hours at a time, saying perhaps three words.

An 1895 Newport, Rhode Island mansion goes on sale for US$5 million

“The beauty of where you are is unbelievable,” Worthington says.

Indeed, the two were so impressed that they are planning to make the island a regular holiday spot, taking a week to decompress there every 18 months or so.

It might sound like a risky proposition: rather than a holiday villa, a personal hotel with a full cadre of staff to cater to a couple’s every whim (from US$2,950 per night for two, all-inclusive).

However, this is the hottest new niche in high-end travel – not a penthouse suite but an entire island just for you.

6 best eco-friendly luxury resorts in Southeast Asia

Gladden is the brainchild of Chris Krolow, the host of US cable television channel HGTV’s Island Hunters, who has spent the past 20 years selling and leasing private islands.

“It’s my baby,” he says. The idea was simple: ­create the ultimate couples-only [make that: couple-only] hotel, a luxe hideaway for barefoot sojourners at which all evidence of other humans is concealed.

Chinese tycoon Yang Zhihui weathers Korean missile spat

Set on a pair of mangrove-fringed islands a few miles off the southern coast of Belize, Gladden is accessible from the capital, Belize City – itself a non-stop flight from several hubs in North America. From there it is a 30-minute helicopter transfer to the resort, making Gladden workable as a long weekend getaway.

This part of Belize is insanely beautiful. It’s like a jewellery box of blue all the way around. The colour, the clarity of the water – it’s like nowhere on the planet
Chris Krolow, Gladden Private Island

The setting is superb. The coast of this Central American nation is fringed with a low-lying archipelago of more than 400 atolls set in crystal blue waters reminiscent of the Maldives or the South Pacific.

“This part of Belize is insanely beautiful,” Krolow says.

“It’s like a jewellery box of blue all the way around. The colour, the clarity of the water – it’s like nowhere on the planet.”

Having two islands has been the key to pulling off the concept, he says. It allows him to keep staff accommodation, buildings for generators, and other infrastructure on the second, smaller island, so guests can feel completely alone.

The staff consist of two couples who tag-team on everything from cooking (one of the women is a certified Le Cordon Bleu chef) to spa treatments (massages are offered, gratis, as often as guests wish).

People have seen and done the five-star hotels – that’s the usual stuff. More and more, people really want to disconnect during their holidays, and what better way to do that than on a completely private island
Chris Laugsch, Welcome Beyond

To prevent visitors getting startled by the staff, there are small warning lights in every room of the hotel that flash red when support team members are venturing across from their stand-alone islet.

Although Gladden has two bedrooms and can accommodate four guests, 70 per cent of Krolow’s bookings have come from couples such as Worthington and Levins, who are often celebrating birthdays or anniversaries.

In an over­-connected world, seclusion has become even more of a benchmark of luxury.

Among other private-island resorts is Little Peter Oasis (US$4,995 for a four-night package), also in Belize, which has space for four guests in a two-bedroom villa built over the edge of a private lagoon protected by a reef.

It is a place where you can channel your inner Brooke Shields – the American actress who played an island castaway in The Blue Lagoon – with or without a bikini.

US$200 million: what it takes to create Royal Caribbean’s ‘perfect’ island

In the Maldives, Cheval Blanc Randheli, the tropical offshoot of French resort Courchevel 1850, has 45 traditional villas on one site, but also operates a four-bedroom Cheval Blanc Randheli Private Island (price upon request) on a nearby private island only a five-minute sail away.

Thirty staff are available to either pamper you or ignore you, whichever your preference.

The 14-acre (5.6 hectare) Dolphin Island in Fiji (US$2,790 for two nights) sleeps eight, and a local fisherman will stop by every day to drop off his freshest catch for the on-site chef to prepare.

Satellite Island ($2,730 for four people for two nights) is a rugged, high-end hideaway with a lodge for one family off the coast of Tasmania.

It is ideal for outdoors types keen to hike in isolation or swim in crisp, clear waters.

6 of the world’s most romantic hotels

In northeast Ireland, the lakeside Trinity Island Lodge is a converted granary that once served the now ruined Trinity Abbey in nearby Cavan.

Starting from US$1,297 per week for six, it features its own sauna and game room, as well as miles of forest trails.

Chris Laugsch, who runs the high-end villa rental agency Welcome Beyond, says: “People have seen and done the five-star hotels – that’s the usual stuff.

“More and more, people really want to disconnect during their holidays, and what better way to do that than on a completely private island?”

Eager to meet the demand, he has just added to his portfolio an entirely private island, an eight-person hideaway off Nicaragua’s coast that is fully staffed, much like Gladden.

With the growing trend clearly meeting a need (or at least a strong desire), it is no wonder that Gladden is sold out for much of next year – or that Krolow is planning a sister property on a similar island in nearby Nicaragua.

However, he is not sure will ever be able to indulge his ultimate goal, which he considered before beginning construction on Gladden.

“I wanted to take it one step further and make it for one person,” he says. “But not enough people travel alone.”

Want more stories like this? Sign up here. Follow STYLE on Facebook, Instagram and Twitter