I'll throw in my .02...about 8 yrs ago we started looking for a place from Astor up also, including various lakes around. after all said and done, we found a place in Satsuma off Dunns Creek.. The fishing is great: bass, bluegill, crappie( my main target),and catfish..
we also catch the occasional red, flounder, mullet, and others
Summer we throw out the crab pots and usually around mid August start shrimping for a couple months..
I fish from the rodman canal to Palatka on the river and down Dunns to Crescent...beautiful scenery and great fishing..
its not far from there to hit St Augustine either