Ding Darling is a well-known wildlife refuge on Sanibel Island in Florida.  It was one of the first wildlife refuges.  Wildlife Drive is a four mile tour through the mangroves and ponds.  While it is a well-known birding haven, the last few years have been a disappointment to many as to number of birds.  On our trip there in April of 2015, there were not many birds and "no-see-ums" were fierce ,so dress appropriately.  It is important to tour at low tide so check the tide charts.  Also remember that  Wildlife Drive is closed on Fridays.  The refuge is a fee park ($5) or free with a Senior National Parks Pass