Nothing says bragging rights like snorkeling in coral-fringed waters off the coast of Tanzania’s Mafia Island as a constellation of whale sharks the length of standard school buses cruise by. And nothing impresses like a hike up a crater to float alongside thousands of stingless golden jellyfish in one of South Raja Ampat’s hidden marine lakes.

This is the new frontier of experiential expedition cruising aimed at a growing subset of seasoned, price-insensitive travelers who’ve already conquered Antarctica and the Galápagos.

For these glitzy globe trotters, the ultimate flex isn’t another five-star resort holiday, it’s unrivaled access to…

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