LucyR, I'd encourage you to be generous in splitting your time between things that will highlight the vacation for you and things that will highlight the vacation for your DH. People sometimes post about visiting WDW alone after their spouse gets burnt out on Disney. My DH and kids sure did. When we starting splitting our vacation time and budget with other activities (my DH loves to sail, our kids like exploring new places), we both enjoyed the vacations more together. Your family and relationships matter so much!
You may consider a couple of nights out on the Atlantic Coast. Cocoa Beach has some really nice, highly rated, beachfront resorts.
Ron Jon Cape Caribe Resort and
Resort on Cocoa Beach) offer a LOT to families and may cost less for a 1BR or 2BR than your nights in a hotel room at WDW. The kids would probably LOVE these places - take a look!
See
Kennedy Space Center - a half day to full day of touring. There's much more there than most people realize, with the IMAX films included. You can check online to see if there will be a launch planned during your vacation.
Visit the Indian River Lagoon area near Titusville to see manatees up-close or take a
boat ride to see them. For more adventure, take an
Airboat ride for a very exciting way to see alligators. These are only about 15 minutes from Cocoa Beach. There's an air show sometime in March, though that won't help you with an October vacation. Anyway, here's a
List of Things to Do in that whole area so you can see what might interest you, from nature parks and national seashore to tourist venues.
Besides Kennedy and the airboat rides, which most kids and spirited parents really enjoy, you may find that you all have so much fun at the resort itself that those couple of days just fly by!!! And you'd still have the rest of your vacation to enjoy WDW! Make sure your MYW park hoppers don't expire and you'll have a great reason to return to WDW for part of a future vacation too!!! HTH!

Have a fun trip!