Hi there Amanda!
Sounds like you have an incredible Disneyland vacation in your future and to be honest, you really can't go wrong with any of the Disneyland Resort Hotels! I have stayed in all 3 locations and to be honest, I love them all for different reasons!
If I had to choose my favorite, I would probably sat The Grand Californian, because of its location and rustically elegant decor! The Grand Californian is literally located in Downtown Disney on one side and in California Adventure Park on the other! There is even a back door entryway into California Adventure which is reserved for the exclusive use of hotel guests! Grand California is a beautiful hotel with a gorgeous pool area and fabulous restaurants! The lobby alone is breathtaking!
My second choice..but it's a very close second, is the Disneyland Hotel! You can read more about my affinity with this magical hotel by clicking the link to view an answer I provided for a guest recently!
-Disneyland Hotel
And my third choice is Paradise Pier. While I love the Pacific Coast Beach theming, this hotel is located the farthest from the parks, even if only a short walk! The prices at Paradise Pier are lower than Disneyland Hotel and Grand Californian, so this "seaside escape" is perfect for the family with a budget! Some of the rooms feature World Of Color Views and be sure to check out PCH Grill each morning for an awesome character breakfast!
-Amanda F