Can I adopt you?
That is a great idea. I would take Mary Lou and Donna's advice and research the trip as much as possible and do it with them.
If it is affordable I would also suggest doing a cruise-tour. This involves a cruise and land portion. One of my regrets was not being able to see more of Alaska. What I did see on the cruise was fantastic. Remember that on the land portion they will have to pay for their meals. This may be a financial consideration.
Princess and Holland America are two cruise lines that have very good cruise and cruise-tour programs.