There's an observation deck on the 4th floor past the shops and on the 15th floor, which is the popular one. You can go up there during the day but when the California Grill opens only diners at that restaurant will be allowed up.
Here is the new policy on the observation deck.
California Grill at Disney's Contemporary Resort Changes Check-In Process
California Grill now provides dining check-in for guests at a podium located on the second floor of Disney's Contemporary Resort.
Guests with Priority Seating will be escorted by a California Grill Cast Member in an elevator exclusively reserved for California Grill diners.
The relocation of the California Grill podium will allow guests dining at the restaurant to experience a unique greeting and a gracious sense of arrival as well as retain the terrace area and Magic Kingdom® fireworks viewing exclusively for guests of the restaurant.
The viewing area at the north end of the 4th floor past the stores is still open.
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