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Ahh yes...paradise. (sigh)
A few ideas from my experiences:
1) The Galapagos Islands -- Spectacular, otherworldly scenery, countless world-class beaches, strange up-close wildlife, and a laid-back, mellow feel! Contrary to popular belief, not everyone sees the Galapagos on guided tours; there are islands that are great for chilling (and visiting independently), like Isla Isabela for instance.
Two Weeks in the Galapagos
2) Peninsular Malaysia -- I second Ali with this one. I haven't been to Pulau Perhentian, but I did enjoy Pulau Tioman to the South. The Perhentians are supposed to be more relaxed, but the Tioman Islands are much more mountainous (which I prefer). Also, the locals were extremely friendly people.
3) Bornean Malaysia -- There are spectacular islands near Semporna, Sabah. Pulau Sipadan has at least one scuba dive site that is considered top 10 in the world--huge dropoffs right offshore, extensive corals, strange small fish, massive predatory fish, and sharks, sharks, sharks! Pulau Sibuan is beautiful for a day trip. I think there's potential for amazing island hopping, and if you're adventurous, there's definitely potential for a real Robinson Crusoe experience.
Diving Pulau Sipadan
And some on the life-list -- the Marquesas islands (the ultimate destination, if you've got time and money), Palau (again expensive, but unbeatable for diving), and the Mergui Archipelago of Myanmar.
As for more masochistic paradises, I vote for tramping through virgin Sumatran jungle or climbing glaciated peaks in Bolivia...but that's a whole different story.