It's pretty difficult to get close at all. Basically to get on the same side of the river as the Cape, you have to be a VIP or press. I've watched a shuttle launch from on the Indian river near the intersection of highways 405 and 1 (maybe the Banana River Viewing site????), however, I think that was under special circumstances (can't remember 100% b/c I was pretty young at the time...)
I've watched a rocket launch from a public boat launch ramp at the base of the highway 528 bridge over the Banana River. It had as good and unobstructed of a view as probably just about any other place nearby.
Here's a few cool pictures of the shuttle you might have already seen. They tell in the caption where they were taken from, so they might be of a little more help.
This one might be taken from the spot by the highway 528 bridge I describe above:
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Photo © Ben Wang
Good luck w/ the pics (if it actually launches...
Hope this helps some.
[Edited 2005-07-21 06:43:24]