MK generally has the special fireworks on the 3rd and 4th
Epcot has the special fireworks on the 4th.
Due to possible capacity closure issues it's best to get to a fireworks park around noon and plan to stay (do lots of indoor shows, and, of course your FP+)
The MK fireworks have the perimeter fireworks that are best if you are in the hub (with seemingly 100,000 of your new, closest friends) with a view down Main Street, too (they use the 7 Seas island launch point, too)
But if they don't add a bunch of projections, it would be pretty fun behind the castle, near BOG...
Other than fireworks on the 3rd and 4th, it's just summer.
Last year, crowds were very, unexpectedly low (like old October wait time lows) but I wouldn't expect that, again. (2012 was pleasant, but 2013 was quite busy)