Hi,
We were just at Fort Wilderness last night for my son's 6th birthday. We live nearby and he wanted a "cowboy" themed birthday. What a treat! We got a campsite for one night. He got to ride a pony and ride in a horse drawn wagon. But the best, most surprising, part for us was at the Trails End restaurant. We mentioned it was his birthday while we were ordering our drinks. The waitress surprised him with a piece of chocolate cake with a candle! They had him stand up on a chair and the whole restaurant yelled "YEE HAW!". Then they gave him a Disney birthday card where EVERY one of the waitstaff signed it!!! When he left he said it was his "best birthday ever!". So, I don't know if they will deliver a cake to your cabin...but they do have carry out service and I would certainly ask! They went way beyond the call of duty without us asking!I can't imagine what they'd do if you ask! Have a great trip!