Suzy to answer your questions -we live out here full time on a work visa. we are in Rotonda which is approx 90 miles south of tampa. we are 10 mins from Boca Grande and the ocean

regarding your visa, the B2 is the '6 month a year' tourist/no work one. without wishing to go into your circumstances here please be aware they dont dish these out easily. The usual recipient is the older/retired person ,in fact they tend to sway againts younger people who just 'fancy' 6 months touring the States (they suspect you intend working). SOOOO if you are in that category you may want to rethink as a refusal has to be declared on an Esta and can lead to that being turned down which in turn = no USA

the other reason people use the B2 is having a criminal conviction (which includes D&D) obvioulsy if thats your case you wont want that discussed too much here !
as for the interview, prepare to be bored silly. as stated you CANNOT take anything like key fobs, PDAs ,phones cameras etc etc in. 100% use Goulds, they have set up a nice littel business there and for 3 or 4 quid safely secure your goods all day if needed. (in fact its such a nice little earner I sat there waiting for my interview going ' 2-300 people a day x£3 times 5 days a week x 52 weeks a year= a tidy profit !!)
you will be given an interview time, its an arrival time not when you will be seen. get there at least 30-40 mins before as you will have to queue (its just like Disney) OUTSIDE in the rain (be prepared ) before going through checkpoint charlie.
once inside you get a number. you then go upsatirs and wait till you are called (this is the quick part) they take all your papers, finger print you then sit you back down.
then you wait...and wait...and wait until you are called for your interview. if succesful they take your passport ,give you a receipt which you then take to the in-house courier who you have to pay by Credit card (no cash). then you leave
i would advise taking the following
Cash ( a tenner in coins for vending machines OR new photos plus some paper stuff too)
a book (no kindles !!)
credit card
ALL your paperwork relating to the visa (you can never take too much but can take too little)
passport
patience
good luck