What MUST I pack for my HM?

Just curious if there were any must packs for a Honeymoon TIA

I don't have a must pack list, but I would definitely recommend taking extra batteries - especially if you have a digital camera.

Our batteries ran out - and the gift store only carried regular batteries... overpriced and died out pretty quickly.

Depending on where you are going:
Bug spray
Sunblock
Perfume that you like
Camera/batteries/film
Makeup
Shoes to fit occasion.
I have this feeling as I am typing that I am missing the point of your question.