We tried when I was probably about 11 or 12 to find Kennedy Space Centre, and failed miserably! Haha! It was quite funny really, I think we probably drove 50 miles in the wrong direction! Might give it a go this year though!
Driving isn't a problem, but I'm not the biggest fan of spending a day at the beach, I'd rather be busy and doing things! (I live about 1 mile from the beach, so it's not a massive draw to me! - although your weather is decidedly better!)
Is Tarpon Springs still worth going to? We went there quite a lot when I was little and remember it being very nice! We used to go to Clearwater for a week too!