I live in Brevard County also (Merritt Island) and I have been keeping my eyes on these boards to learn about the Adventure Islands with the intent to purchase primarily for fishing in the ocean. I finally found a hobie dealer that would rent me an Adventure island to try, and will have a demo in the coming weeks.
Glad to hear of another so close. Suprise you found one who would rent you an AI. I sure tired to do that, but finally just bought them and have not regreted it. (Merritt Island) I put out at Kelly Park off or Banana River, with the wife often. She does not like the ocean and enjoys the spoil islands. I will be hitting the ocean with a friend on Friday morning, off of Jetty Beach, if Huricane Bertha does not effect offshore. I will give you an e-mail soon, off to work for now.