Hey Nigil,
When you are looking at the Heronry from the parking lot is it due East, so morning time they would be back-lit, afternoon is better for lighting...if the sun ever comes out on the weekends
Directly south is a cemetary and golf course, and there are plently of ponds in each of these places.
I don't know what else is around there for them, I'm not too familiar with the area.
Hope this helps.
I might see you there this weekend.
I plan on heading up there again Sunday afternoon.
Meghan