Hi Diego,
Prepositions are always confusing, aren't they?
But when we are referring to special holidays like Christmas or Easter, we should write them in capitals and use the preposition "at".
I don't
prefer a "proposal", it
is the correct word used to mean "proposta de casamento".
And finally, there is a slight difference between "love" and "adore".
We can use either "love" or "adore" to refer to a person, for in this case they mean almost the same, but in this text the person is referring to "things" he liked a lot, not to someone. See what I mean?
We don't "adore" things, unless they are images of idols.
By the way, you should choose to use "everything" or "what" in that sentence, not both of them.
And I'm not "the boss", just someone trying to help you improve your skills.