Thanks for all of the really great ideas! Some of them are so creative- like the door knocker (though in this case my boss is keeping her maiden name- so it would have to be engraved twice! ). The carriage ride also sounds really nice.

I think I will try to find something related to music- my boss plays the piano beautifully and still teaches a few nights a week. A concert is a good idea, I will have to look into that. The only problem is they only live in the Denver area a few days a week, and have their main residence in Estes Park (which I don't think has many concerts, but I guess I could find out!).

I would feel funny giving cash because my boss pays me, and also she is marrying an aerospace engineer turned software developer who really doesn't need cash. I would actually prefer money myself to do many things to take a honeymoon but I think in this case it would be a bit awkward.