travel advice for the florida keys

Hi,

My wife and I would like to celebrate our 10th anniversary in the
Florida Keys (we live near Daytona now). We would like to spend the
week from August 1st through August 6th down there. We plan on taking
our three kids (ages: 8-7-4) with us.

We are both experienced free-divers (with scuba experience)

We need some advice on the following matters:

1) which part of the keys is best adapted to *free* diving (not
scuba)? (we will probably take turns going down and pulling our kids
in tow in an inflatable boat - so it has to be near to shore)

2) where should we stay? We would like a cheap but clean
motel/house/condo/cabin *away form the noise*

3) do you think that it would be a good idea to rent a camper for this
trip?

4) any other tips?

Many thanks in advance,

GP