Hello there Brett!  Thank you for bringing your great question to planDisney, I'm happy to help!
Disney's Grand Californian Hotel is such a lovely place to stay, it's one my favorite hotels!  I'm so sorry that you're having trouble booking your hotel room, I'm hoping we can find a solution for you.  
The 
Australian Disneyland site does recommend that Guests book their trip through a local travel agent.  A local travel agent who specializes in trips to the Disneyland Resort will have some great tips to ensure a smooth trip to the States for you and your family!  I'm hoping they will be able to help book your hotel room at Disney's Grand Californian Hotel & Spa as well.  
During your stay at Disney's Grand Californian Hotel & Spa, you have great dining options right on-site at the hotel.  We love to spend a non-park day with a 
character dining experience at 
Mickey's Tales of Adventure Breakfast Buffet at Storytellers Cafe, it's a great way to still get Disney magic in your day!  You can enjoy their delicious breakfast buffet while also visiting with your favorite Disney pals.  
GCH Craftsman Grill is a great place to grab a meal or snack, especially if you're heading to or returning from the parks, I'll never turn down an order of the Baked Nachos!  
Best of luck booking your trip Brett, I hope everything comes together for you soon!  If you think of any other questions as you plan your trip, 
please come back to planDisney and ask. 
Have a magical day!
Melissa