Overall, this Sarasota site has proved to be the best resource: http://www.sarasotafl.org/Mote Marine Aquarium - This has been one of my favorite attractions as long as I can remember... about 15 years! Hugh the manatee holds a special place in my heart.
Siesta Key - Listed as the 2nd best beach in Florida after South Beach and one of the top 20 beaches in America!
St. Armands Circle - A fun place to walk around, shop, have lunch, get ice cream and people watch. (Big Olaf Creamery is my favorite nostalgic stop.)
Marie Selby Botanical Gardens - Supposed to be a wonderful place to explore.