How to honeymoon?

Picking the honeymoon excursion is tough, there are so many variables.

How to figure out the average flight cost, the average package cost, etc.

There are obviously multiple air carriers to choose from, and multiple venues to select from. So far I'm focusing in on sandals, which comes highly recommended, but it's hard to compare/contract the options.

And how long should the honeymoon bet? 7 days? Leave and return on Sundays? What time is ideal to depart?

Lot's of variables.