Some 16 nautical miles off the coast of Tanzania, Thanda Island was bought by Swedish investors the Olofsson family ten years ago to complement their South African Thanda Safari lodge. Now it’s a luxurious Indian Ocean retreat, says Condé Nast Traveller, with a “sprawling” villa and two opensided beach “bandas” (chalets) that make ideal hangouts for teenagers. The main house has five bedrooms, with four-poster beds. There’s a tennis court and a boat house crammed with kit including jet skis; and other activities – diving, kite-surfing, yoga – are easily arranged. The chefs specialise in spectacular seafood and Swahili-style “feasts”. From £7,800 per night for up to ten people. +27 71 611 5348, www.thandaisland.com.