For the most convenient and flexible transportation, it's recommended to rent a car for the whole trip. The cost for a compact car is around $40-60 per day. Alternatively, you can use Uber or Lyft to get around, but it may be more expensive and less convenient for larger groups.
If you have more time, you can consider adding other popular attractions like the Kennedy Space Center, the Orlando Eye, or the Gatorland. If you have less time, you can skip some of the parks or combine them on the same day, but be prepared for a full day of walking and waiting in lines. Don't forget to bring sunscreen, comfortable shoes, and a refillable water bottle.