Take a big photo mat with acid free markers and drop off at guest services for all the characters to autograph. Put a nice picture of your trip in when you get home.

I'd do brunch at Palo for the adults with your daughter in the kids club. You probably also want to sign up ahead of time or as soon as you get onto the ship for your daughter to get timed tickets to meet the princesses. Now instead of waiting in line for 30-60 minutes to meet the popular characters, you can get timed tickets and your daughter can meet and take pictures with 6-7 of the different princesses at the same time.

Other than that, there isn't much else you need to reserve ahead of time except for excursions.

We are cruising on the Disney Dream in February with our 4.5 yr old DD, my parents, and my brother. First Disney cruise for all of us. We see you can sign up for things online ahead of time. What are some must dos? Do you have to sign up for everything ahead of time? What can't we miss? I want to make sure we get the most out of our experience!