Definitely check out the St. Pete Mad Dogs they have members all over and always having training and events going on. If you're at MacDill Base, St. Pete is just across the bridge and there's training groups all the time going on. Their website is
www.stpetemaddogs.com Also, there is a Bicycle Sports opening up in downtown St. Petersburg, which will be great. In fact I got a flyer and their grand opening is 1/19 and John Cobb is going to be there for it.
Great area for triathletes!
Like was already mentioned you'll be near Clermont, Fl too, where there are a lot of tri's and they have some actual hills to train on there (in Florida!)