Stuff to do:
*If you do the "out doors-y" stuff then the Citrus County area is beautiful. Especially Crystal River and Homasassa Springs.
*I agree with Matt, Tarpon Springs has the sponge docks (on Alternate US 19) with great restaurants and the Tarpon Aquarium as well (it is small, but cheap and you can feed the nurse sharks they have- I've taken the kids a couple times). It's a great area to spend the afternoon.
*St. Pete/Clearwater/Madeira Beach/Treasure Island has some of the nicest beachs on the Gulf Coast.
*And Matt was referring to the Sunshine Skyway Bridge (I275 Southbound to Sarasota from the south end of Pinellas county)
If you plan to stop in the Hernando area at all (like Weekie Wachee Springs or something) I'd be happy to PM you my number and maybe we can meet up for drinks or something
Enjoy your trip! Take Pics! Share with RS!