When the weather up north turns cool, birds and bird watchers flock to Sanibel Island, famous for its large wildlife and bird refuge. Occupying almost a third of the island, the J.N.(Ding) Darling Natural Wildlife Refuge is home to many rare species of birds, reptiles and mammals. Anyone interested in the inner workings of our fragile ecosystems will not want to miss it. Seashell collecting is another big activity on Sanibel. Grab a bucket and scour the beach for colorful conchs and mollusks. Then head out to the Sanibel Island Lighthouse. It's not open for tours but can be viewed from an adjoining park area. The island is extremely laid-back and lounging on the beach with a juicy novel is as good a plan as any.