I can think of scads of uncrowded honeymoon destinations depending on your tastes. New Zealand is lovely as are some of the smaller Canary Islands. Iceland is also quite unique.
Have you considered the Irish countryside? Or what about parts of the Philippines? There are also some lovely places in Thailand and Cambodia as well as Indonesia and Vietnam.
Avoid Phuket and Bali though if you don't like crowds.
Las Vegas is more of a bachelor/bachelorette party spot, not honeymoon soooo no one should really be suggesting that. My husband and I went to Jamaica, and stayed at Secrets - St. James. It is an adults only all inclusive resort.
If you're looking for something beachy, I would highly suggest any of the Secrets locations.
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