Most people think of Sanibel and its quirky little sister island, Captiva, as interchangeable. True, they're both quiet spots with great shorelines, but there are a few differences. Here's a cheat sheet: Sanibel has better shells on its beaches, but Captiva's dining is more eclectic. Souvenir shopping on both sides of Blind Pass Bridge (which separates the two isles) is fairly evenly matched, but Sanibel has an inside edge on art galleries. In short, consider spending your days on Sanibel, then hop over to Captiva for a nice dinner. Stay a few extra minutes for one of the romantic sunsets along Captiva Beach. Recent travelers found this beach quieter than the ones in Sanibel. Even so, parking is limited, making it difficult to bring your own set of wheels.