Would like to do more than 1 island.
Also, to what extent will we need to rent a car?
My husband and I are experienced travellers in our early sixties.
I sent you a private message with the link to my Azores guide. It will have almost everything you need to know, except which islands you must visit. That is a personal choice, although I would say Sao Miguel is a must for a first visit to the Azores.
Carl