I would vote for cutting out 2 of the cities and go just to Paris. The first and last days are mostly lost due to travel and then you lose time traveling from one city to the next. Ten days sounds like a lot of time, but it is really not.

While this is not the FT way of traveling, I think it would lead to a better honeymoon experience.

You could do Rome also, but that might mess up a later Italian vacation.

Just my 2 cents.