It’s changed recently, I think now the standard half board lets you have a buffet in some park restaurants, and some of the hotel restaurants, but not one of the Disneyland hotel ones. The buffets are exceptionally varied (there will be something that your fussy eater will eat!) but your half board deal probably won’t include drinks, it didn’t when I was last there. I would strongly advise you book, as there are so many families with children everyone wants to eat at a similar time, and you don’t want to be hanging around. You can most likely book with the concierge at your hotel, or there’s a number you can call in the link below.
You can book a character breakfast which will probably include Minnie, and you can also get a park guide which details where the characters will be. For meeting Cinderella there is the Princess Pavilion (where you can queue to meet whichever princesses are in there), or there is a restaurant called Auberge de Cendrillon where you can have dinner with the Princesses wandering around and meet Cinderella’s mice. It’s pretty expensive though!
Rides wise, The Crush Coaster is my ultimate favourite, it doesn’t go upside down but it’s incredibly fast! I also like Big Thunder Mountain, Indiana Jones and I’ve got a weakness for the Storybook ride...
The website www.dlpguide.com (unofficial but brilliant!) has got menus on it, and this is a link to the up to date (I think) Disney webpage on meal plans
www.disneylandparis.com/en-gb/guest-services/meal-plans/
I hope this is up to date, I have been to DP an embarrassing number of times, but not for a couple of years so I apologise if it isn’t! 