* purchase a guide book
* evaluate the fear factor of your 7 year old, I always recommend having the child watch the Wizard of OZ and their response to the variety of scenes, for my 7 year old it was the talking trees, unfortunately I didn't seek advice, and , his first ride was Alice, lots of talking plants... would not ride dark again.
* as a first time visitor with small folks, I would prioritize parades over fireworks and shows.
*write down on a note card all the bathroom locations, some of them are not easy to find.
* plan resting times, like the long boat ride on Small world or the train ride loop or curbside for the parade.
*if you are early risers, then to plan to split the day, leave the park from 1-4 to nap, eat and hydrate, then return for a few hours more in the evening. You will be tired, you will be dehydrated, comes with the territory of being a first time visitor.
* make or purchase autograph book for 7 year old to use.
* also discuss spouse time at night, it is possible for one adult to return to lodging with tired kids and one adult to stay in the park to ride the adult rides. It is safe and crowded sidewalks at night to walk.
Fairfield is a Marriott, so anything wrong, can be fixed. It is three towers and very elevator dependent. As you walk pass the other lodgings, you can make judgments on what your next lodging would be because there is a wide range of choices on how to access a room.
the cost of the extra day is worth the price, you will have a early morning access one of those day, that can be used by an adult if the kids sleep in or by the entire family. The concept is that
Disneyland is not 100% friendly for children your age, and if one of you is struggling with why Disneyland, then the extra freedom for the one spouse will enhance your own magic.