Hal,
Unfortunately the park schedules for October are not yet available, so it is hard to know which park will have Extra Magic Hours on each day of your visit. But forgetting those for the time being, here is what I would plan on doing;
- October 17 - Arrival Day, see below
- October 18 - Magic Kingdom
- October 19 - Animal Kingdom
- October 20 - Epcot
- October 21 - Hollywood Studios
- October 22 - Magic Kingdom
- October 23 - Park of choice, see below
- October 24 - Magic Kingdom
For your arrival day, dependent upon when you get there, I would choose not to rush to a park. Instead I would take in a day at the resort. Visit the pool, tour the resort grounds, and plan a special and fun dinner.
For the 23rd, I would leave my plans open. After you have visited the three non-Magic Kingdom parks, use this day to visit the one that left you thinking, "I really wished we had more time there!".
I am glad to offer more suggestions, just ask. Let me know more about your interests and I can come up with some activities and restaurants that will suit you!
Have a magical vacation!