My wife and I celebrated our 10th at California Grill, and I can honestly say it was the perfect place for our celebration. When we came to our table it was decorated for the occasion! Mickey confetti everywhere, various decorations around the table, complimentary champagne with strawberries and a few chocolates set on the table...they definitely were working to make the night special for us.
When the fireworks were about to start, and the manager came over to inform us the kitchen would be holding our complimentary dessert until we were finished viewing the fireworks from the observation area. When we got to the observation area everyone there yelled "Happy Anniversary". Yes, my wife cried and I teared up, this was a truly magical moment. When we returned our server had just placed our dessert on the table along with a card with about 30 signatures on it from staff and 1 large signature that said "Happy Anniversary, Mickey". THE BEST ANNIVERSARY DINNER EVER!!!
Now, I can't promise you will have the exact same experience at CG, it all depends on the staff and the crowd level in the restaurant (we were there early may nearly 9 years ago), but I can say for sure, you will never get that experience at Ohana!
Congratulations, and I hope you have a magical anniversary!