Lucky my wife is not having a full knee replacement.  I am not sure we would be able to travel a month later after that.  It is orthoscopic to flush out stuff in her knee.  The Dr told her eventually (or now) she is going to require a full knee replacement or just learn to live with the pain.  However, he recommended starting with this procedure with a much quicker recovery time and a chance (albeit small) that she would bring the pain to a tolerable state.  
She is the family gym rat, distance swimmer, got to be outside doing something in our household.  She discovered the E-Bikes online already and was looking for adventures on our drive home from visiting our daughter yesterday.  4 hours trapped in a car provided her all sorts of time to plan!  We shall see if the knee will support her desires.  
Thanks for the input and other adventures welcomed.   I really want to get out on the water for a day sail.