Arthur Frommer…from the Frommer travel guide books has ranked Sanibel as his top travel destination in the world:
1) Sanibel Island, Florida: Off the west coast of the Sunshine State, a few miles from Ft. Myers, is this idyllic haven of white-sand beaches, condos whose seafront apartments are available for weekly rentals, excellent restaurants, good shopping–and most important, the Ding Darling Nature Preserve, visited by thousands of birds of every species, who bask in the sun after diving for fish, and are one of the great natural sights of wildlife in America.
You can read his full post here: Frommer Sanibel Ranking