I was just wondering what theme parks do we get discounts for or for free to get in going on vacation and would love to take my children to Disney World!!! 

We went to Disney not this past summer, but the summer before. They have discounted tickets for military. I think you can buy them before you go through MWR but we just went to the Shades of Green resort while we were there and picked them up. Check MWR's travel page for info because the price changes every year. And you only get so many every year too. It's a pretty good deal. 

Here is a list that I found...

Military Discounts

http://www.militarydiscountscentral.com/amusement-parks 

i'm a little disgusted with disney at the moment.

for years we have wanted to visit dollywood. we lived in tennessee but never had the opportunity to get away.
they have 30% military discount.

Dollywood 

Sea World and Bush Gardens are free for military one visit per year. 

We just went to Disney World "Salute the Troops" which has been extended until September 2013. It was out of this World cheap. 137.50 for 4 day hopper pass. The soldier is allowed up to 8 guests I believe. Go to the website. We also got a Villa for 39.50 a night right outside the park. Whole trip was under 500.00. We are going again. Have fun.