I recommend doing the MK fireworks on the 3Rd. It'll still be busy but not as bad as on the 4th. Then you can go to another park on the 4th, I recommend DHS because they'll have special fireworks and they're awesome. But the MK 4th of July fireworks are my absolute favorite!!!! You'll have a great time!
I had someone else tell me this also about MK on the 3rd and DHS on the 4th! Are the fireworks at MK on the 3rd the same as the 4th?