The Grand Californian is wonderful. One of the best parts is the private entrance to Disney's California Adventure. Its directly across from Grizzly River Rapids. So if you managed to get soaked, you can easily walk back to your room, change, and be back in DCA in no time at all!
The rooms have a mini-fridge that is already stocked with various items. I don't think you can get a seperate fridge without getting charged.
Also, if you are a light sleeper, you may want to avoid the rooms on the lower floors above Downtown Disney. While Disney installed thicker glass to reduce noise, I could still hear the music and its on until midnight. I got used to it eventually. But, if you think that may be a problem, request not to be placed in one of those rooms.
Park hopping at Disneyland is so much more easier than WDW. Its one of the pluses about the resort. You don't have to think about transportation time like you do in WDW.
If you have any more questions, please ask!