I have fond memories of the Hillsborough River.... Lived in Tampa for the first 18 years of my life.. I remember catching a 4lb. bass out that river while fishing with my dad in our little jon boat.. My dad told me if I caught a bass over 5lbs. he would get it mounted for me.. The fish I caught may of went 3.5-4lb's.. At the time I was convinced that it went over 5lbs. and wanted my dad to mount it for me.. I was probably 7 years old and just learned how to cast a baitcaster.. Long story short.. The fish escaped through a small hole in our fish basket and I blamed my dad for turning it loose so he wouldn't have to mount it.. :p The last time I was there we went to bass fish but it turned into a Alligator Gar fest.. Lost a couple good spinnerbaits that day.. I'm sure you won't have problem finding panfish in that river...