Woodlawn Lake has their usual fireworks spectacular, but get there early, parking is a pain! I should know, I used to live two blocks from there! There will be lots to do all day from 10:00 a.m. all the way until 9:00 in the evening, with the fireworks starting right around sunset.
Lackland AFB will also have a fireworks spectacular that starts at approximately 9:45 p.m. Parking is free and so is the fireworks but you must be able to show legal, government-issued ID for each person coming in and proof of up-to-date insurance for base access. Again, parking and crowds could be an issue so get there early. No coolers, cameras or pets.
The Sunken Gardens Theater will hold the largest San Antonio 4th of July celebration. It starts at 8:00 p.m. and will feature the San Antonio Symphony Orchestra.
If you don't require fireworks to get your 4th party fix, try the Black Light Art Party. From their blog: "Celebrate Contemporary Art Month in San Antonio as the creatures who brought you the Black Light Art Party & Black Light Art Party: Transparent Spectacular return for a third year of fluorescent madness! Black Light Art Party @ The Calcasieu Gallery on Broadway! Michael Aaron Casares, Ernest Vidal & Gil Casares, Eneida Garcia and more display a vast array of new work as well as some memorable favorites from previous years."