Hi Amy! Wow, you'll be at Walt Disney World in a few days. How exciting! Both the Animal and Magic Kingdoms open at 9 am when you're there, and at 8 am for early Extra Magic Hours - March 8 and 12 for the Magic Kingdom and March 9 and 11 for the Animal Kingdom. Click
here for the Magic Kingdom park hours, and
here for the Animal Kingdom hours, and then click on the individual dates for parade times etc.
March is traditionally a very busy time with school breaks happening at various times throughout the month. My best advice is to get to the parks at opening time. You would be amazed how many attractions you can get in during the early hours. We often head back to the resort mid-afternoon for a rest and a swim, and then return to the parks later in the day, refreshed and ready to go.
Have a magical vacation Amy!