drive is perfect for watching the island's wildlife and looking at the island's native vegetation. To show that preserving the wildlife really is important, the drive is closed one day every week, Friday, so that the wildlife can have a day to themselves where they can scavenge for food closer to the drive and not have to be bothered by or fearful of humans. There is also an education center which features "interactive exhibits on refuge ecosystems, the life and work of "Ding" Darling, migratory flyways, and the National Wildlife Refuge System." Beaches and seashells Sanibel beaches attract visitors from all around the world, partly because of the large quantities of seashells that frequently wash up there. Many sand dollars can be found as well. One of the reasons for these large accumulations of shells is the fact that Sanibel is a barrier island which is "part of a large plateau that extends out into the Gulf of Mexico for miles. It is this plateau that acts like a shelf for seashells to gather." Sanibel also has an "east-west orientation when most islands are north-south. Hence, the island is gifted with great sandy beaches and an abundance of shells." People who are lucky enough to find the elegant brown-spotted shell of a Junonia on a Sanibel beach often get their picture in the local newspapers. Junonia volutes are reasonably common living in deep water, but they only rarely wash up; a beach find of a whole shell is greatly prized. Junonia shells can be purchased at local shell shops, or can be seen on display in the Bailey-Matthews National Shell Museum, in some of the glass display tables at the Sanibel Cafe, or at the Sanibel Shell Fair in early March. Throughout the year, many people come to the beaches of Sanibel to gather shells. People are often seen bending down as they look for seashells, and this posture is known as the "Sanibel Stoop." There are beaches almost all around the island. There are even beaches along the Sanibel causeway, and these are great for fishing and windsurfing. However, beach parking on Sanibel itself is very limited, and in high season finding a convenient parking space can be a challenge. Lighthouse Beach is named after the famous Sanibel Lighthouse, which includes a popular fishing pier and nature trails. The most secluded beach on the island is Bowman's Beach; there