Hi, Jenna!
I checked last year's weather in Orlando and it was in the mid-80's for most of the month of October. That sounds like perfect swimming weather to me! I think your plan for a pool day or day at a waterpark sounds like a splashing good time!
On your "day off" from the theme parks, you might also want to visit
Disney Springs. This wonderful destination is the perfect place to shop, dine, see a movie, or even go bowling. My family loves to make a lunch stop at
D-Luxe Burger. There burgers are out of this world, and the milkshakes are worth every calorie! You can even use
Mobile Food and Beverage Ordering to avoid lines. Order your meal on the My Disney Experience app, pay with your credit card, and your food will be prepared. Stop by the Mobile Order Pick Up counter for your delicious lunch or dinner!
Enjoy your swim/shop/relax day during your visit to Walt Disney World!
Cathy