Hi, Karen!
You've certainly got some terrific reservations for your trip in March! My family has experienced dining in Cinderella Castle (a special treat, to be sure!) and at Chef Mickey's several times and we've always had a memorable time. I'm sure your granddaughter will love the royal treatment she will receive from her Fairy Godmother as she is transformed into a princess at Bibbidi Bobbidi Boutique.
PhotoPass+ includes the following attractions: Space Mountain, Splash Mountain, Buzz Lightyear's Space Ranger Spin, The Twilight Zone Tower of Terror, Rock 'n' Roller Coaster, Expedition Everest and Dinosaur. The participating Character Dining locations are: 1900 Park Fare, 'Ohana (breakfast only), Spirit of Aloha Dinner show, Chef Mickey's, Cinderella's Royal Table, Tusker House (breakfast only), Hoop Dee Doo Musical Revue, and Princess Storybook Dining at Akershus Royal Banquet Hall.
Here are a few things to take note of as you consider whether the regular PhotoPass or the PhotoPass+ package is the best choice for you: At Cinderella's Royal Table the photo package is included in the cost of your meal, while at Chef Mickey's the photo package option is an extra cost. Remember that you can also bring your own camera to take photos of your granddaughter with the characters at dining locations. My family has found that often our "candid" photos are the most spontaneous and fun! At Bibbidi Bobbidi Boutique the Imaging Package add-on is $29.95 (plus tax) and includes one 6' x 8" and four 4' x 6" photos. Again, you can also take photos with your own camera, if you choose.
You can take advantage of a discounted pre-order price with this
Disney PhotoPass Special Offer. And you can find some very useful tips for using Disney's PhotoPass service on the AllEars.net website.