KOA campground, did that about 10 years ago. Its on Fiesta Key just south of the 7 mile bridge...cool place. Camped in Aug...hotter than hell.
We can do a summer trip, but its harder for me. Besides the fact that we are going to Cozumel again for 2 weeks in July, we are busier then.
Marathon would be cool. Just a few miles south is Looe Key, done some nice dives there. There is the Thunderbolt wreck(nice dive) and its a little quieter that Largo. I would be in for Marathon, just a bit longer of a trip from Miami.
Dove with these guys last time I was there
I will not be able to do any training or diving for the next several months
Like I told RR, do you classroom up north and your checkout dive down there. Most ops will do them for you.
Just though a break from the cold would be nice for some. I know I woudl like that and Jan is the slowest month for me at work.