Hopping into a more fit Spring, and Body!

It's officially Spring, though we've " hopped " from a very mild Winter, seemingly directly into Summer.
Speaking of which, it's nearly Pool Time in my neighborhood!
I've got a question: what tips do you have, readers, for tightening abdominals and toning thighs?
I'm pretty happy with my ol' bod, but want to feel a bit more confident, before slipping into my (somewhat skimpy) swimsuit.
Any great exercise fanatics out there, with recommendations?
Enjoy Spring!
Peace, kids.