I think it is wonderful that you want to go to that much trouble for
your girl. And if that sort of a trip is what you think she will love go for it.

Invite her on the trip. Nice trip for fun with the girl ! That's the only reason you need. Have the room filled with roses ( or whatever she likes) . Have a table set in the window with champagne and crystal. Music playing. Something very special to you both. Check in and casually go with her up to the room. Open the door. Kneel . She may cry.