Nbob,
If you thought the Pinellas Trail was nice, you should have come to Tampa and ridden at Flatwoods or the Upper Tampa Trail. For me, the big problem with the Pinellas Trail is that (depending on where you are riding) there are too many stops and too many multi-lane streets that you have to cross. Flatwoods is a closed to traffic park with a well paved, one way loop where you can get all the speed you want. There is also the Suncoast Trail that runs through three counties and has some pretty good rolling hills toward the north end of the trail.
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