Where’s the best place for a winter sun honeymoon?

Perhaps you'd like to go on a South Seas luxury cruise and hit Tahiti, Fiji, etc.?

Norwegian Cruise Lines has
13-Day South Pacific From Papeete To Fiji: Fiji, Moorea & Bora Bora

There are other major cruise lines who go from Sydney to Fiji, etc.

I guess it depends upon what you want to do.

?

Do you two like to explore? See sights?

Fiji is nice I hear

Caribbean

Mauritious

I`m just going to throw this out there and say southern Italy?