Firstly, find a cruise specialist travel agency,. they will walk you through the process with expert info...decide what islands you would like to cruise to,and see what ships meet your time frame, and destination criteria.
An inside cabin will have 2 twins, pushed together to make one bed..your ta, can find the best placed cabin and a good value , to have more $$ to enjoy onboard..
RCI with their Freedom class ships have the flow rider, walk climbing wall,and a promenade , always busy, with shops and Restaurants, cafes etc...and a parade!
The New CarnivalrDream, could also be a great fit.
Make sure you investigate all the things that could add to the cost of your cruise onboard. Tips are already added toi your bar bill..photos are pricey....excursions....knowing before you go, means no surprises....
Do get travel insurance..the inexpensive cost, will be of help with any trip interruptions or medical issues that can occur...Age means nothing if you have to be evacuated off a ship..the cost can be catastrophic, if you are not covered.
I hope I helped a bit....more info to come from many, I am sure.
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