Well, I haven't lived in Orlando since 1968, but I was up there a month or so ago and I drove by the lake just to see the big fountain. I parked on the side with all the houses, not the downtown side, don't know whether it was west or east...I wasn't paying attention then, got out, and walked along the stone walkway by the lake. I saw a few families strolling along, with children and baby carriages. I did get some funny looks, don't know why, guess because I was alone.
Peter, the lake is sort of in the middle of the city, it's not really secluded, it's just a pretty lake with a big, somewhat famous, colorful fountain in the middle of it, so you could probably shoot off some fireworks, then leave quickly before the cops chase us away, but maybe someone who lives there now could give us a better location where no one would mind fireworks.