That's where it is for me. There's a section called "Offers & Communications" that has subscription options. There is no separate option for Power Up - it's all or nothing.
No, it's not. The Micro$oft program is called Excel.
Sorry, but that's been a failed attempt for years. Pretty much everything they've done recently has been in direct opposition to it.
Regarding the suggestions above about bringing gifts for the crew, I would recommend heavily against this. Imagine you are living in an area about the size of a double bed - how much extra crap do you really want? From discussions I've had with crew, most of the gifts they are given get thrown out.