Tweetyeah bro, my hometown is Jacksonville and I am going to school at UCF now in Orlando. There are alot of quality gyms there, a big name is the Powerhouse chain (which I go to when I head home). There is around 5 of them in the city, and if you join one you join them all. There is also a Golds Gym in Jacksonville, Golds Gym is where I go to now in Orlando. I am pretty sure you can be a free guest at Powerhouse Gym, there is one on San Jose Blvd, Blanding Blvd, and a few more areas. If you know the area you will be staying just reply or send me a PM and I can find a gym in the area.