“I shall clean myself up and surprise her at work tomorrow with nothing more than this poem and then take her to lunch.”
I assume clothing is implied. If not, good luck getting seated and served at lunch.
What about a small bouquet of flowers, or even one flower, to serve as a focul point and set the mood (of course if you’re unclothed I suppose you’ll have that issue taken care of) before you start reading the poem?
Congratulations and good luck!