Here are the downloadable gpx files for the two longer routes of the 3 rides:
For the 12 mile family fun ride, ride 6 miles north on Casey Key to end, turn around and ride back to beach parking lot! 12 miles (or just go north until you are half-way tired and turn around!)
Here are images of the routes if you just want a quick check on where they are going.
30 miler: (image file here)
Metric Century (image file here)