Florida Vacation spots : Senior citizen perspective?

Hello All,
The best Gossip Magazine Online www.gossipmagazineonline.com

The best travel site Great Vacation Spots www.greatvacationspots.net

I desperately need your help in coming up with vacations spots in Florida. You see I will be travelling with my parents and my wife for the first time to florida. I do not have any clue about the parks / tourist spots there. More over my parents are not really interested in rides and water sports. So I guess Universal’s Island Of Adventures wont be a great hit. I am not sure if the rides in Disney world are very scary that they cannot be sustained by old age people. What about Busch garderns? Is it really worth seeing? I am coming from Atlanta and they have already seen aquarium here and in Tennesse so I dont know if Water world would provide them something very different. I was even thinking of driving along the Key west. What can we do in Keys? Are there some sight seeing places there?

Any thoughts/ suggestions would really help.
In MGM can we see real sets/ studios in which they film movies /shows? My dad is really interested in those. Also what is the most economic way of buying tickets for these shows? AAA / local buyers/ Any special credit cards / Coupons / Costco etc?

Also would 3 days be enough to cover to Disney, MGM and a couple of shows? Is regular Universal different from Island of Adventure?