Rode Graham Swamp in Palm Coast about 3weeks ago and was pleasantly surprised. Very fun trail but it will take you a little out of your way. Ft. Pierce and hiapatokee are fun also, along with what was said above.
I've only road Quiet Waters in terms of trails, but I want to venture north. Fort pierce trail looks kind of cool. Pinehurst and Dyer seem to be too small to make it worth the trip. Halpatiokee seems like I nice ride just not technical. Palm Bay seems to have a nice cluster of trails, just too far for me to drive for that.
Ft Pierce is riding great now, nice local gem. Ride with an Airborne member and check it out. I ride it once / week, but avoid it when wet.
My personal fav. near Orlando, is Snowhill (Little Big Econ). Rode it yesterday and was excellent after previous day rain. Tons of natural variety and easy to do 20-30 miles without getting bored.
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