If you like vintage bikes, go down to Deland Friday. There, at Stetson University, they have the vintage bike show and auction. You will see one of the most diverse collections of bikes anywhere there, this side of AMA Vintage Motorcycle Days in Ohio.
If you take the A1A north towards St. Augustine, you can visit Marineland... http://www.marineland.net/
Take you wife down to the Lighthouse Restuarant at Ponce Inlet for dinner. This is an awesome place to hang out, she'll love you for it.