Hey sounds like a great trip! But dont plan too much, and dont drive rush hours! Rental cars have a heck of a tax on them in FL so check the rates-shop around! I would do a day or two in WestpalmBeach, I dive out of Boynton beach that is the south end this small burb has 1/2 dozen dive boats and I dive with=
www.splashdowndivers.com
Great boat,Great staff=The best,!! Safe neat clean boat , and dive shop on site for equipment and fills un-like some opps* Parking next to boat! Parking at some other WPB dive boats can be a hassle trust me!
They have some sweet reefs with lots marine life than more than you may find in the Keys they do a drift dive reef & wreck,Boynton lacks the motel/hotels so locals and the divers in the know dive thease opp's,
North WPB has some good opps,nice drift dives and fun sites to dive more tourist and money type.Pompano Beach has some fun boats,
We tend to stay at a pals place,but have rented off Ocean =a block or two in,, that time of year you plan for 1/2 of a ocean hotel/resort cost's
The Keys have some Great dives not sure on your skills,but the Bibb,Duane,Grove ship wrecks and so on are the some of the Best Keys dives I have done. KeyLargo would be a good base camp are and lots too many good opps,and a few not so good.
We stay at Dunns Ocean view Inn pub and motel,Islamorada kind of mid keys,
www.theocean-view.com
This small motel has a sweet pool,new! only a few rooms-all new re-done with tile,mini fridge,micro,and BBq to cook your fish or lobster on! get a room away from the pub cause this place rock's-I mean realy rocks at night! Owned by a Ret Pro Football player he has put his money out in this palce. One note on the Keys some places are nice and you pay big $$$ some are dumps so check them out first!
Also in the North Keys-do a Google = John Pennekamp coral reef park is a good dive area,boats opps run too and from this dive area=easy dive !
Also check out Robbies in Islamorada and feed the Tarpon,Its the best $1 .00 or two you will spend in the Keys,they have a nice are,boat rentals,shops-ice cold beer,fishing charters,nice place to relax after a long day!
www.robbies.com
That time of year water is in the 70's and well i'm used to cold water "Lakemichigan" but locals tend to use 7mm to dry suit's if they are in water all day,The SI is were the wind will cool you off and you need some top side warm stuff ie. like sweat pants wind breaker=I use a 3mm full suit with a 1mm microprene first layer and am toasty,but dive with boats that have hot water and that realy makes you warm up nice! you pick the gear you will like to use.
Crystal river I would use Birds underwater,
www.birdsunderwater.com
They run a nice shop,lots of place s to stay on the water,Call them to plan a dive or tour their DM's and Inst's can find and show you the Mantee and they can be hard to find as it cools down!also a cool dive in a undewater cave under the Crystal river just ask and see the pet shrimp!
Get some great travel info also inc maps at
www.visitflorida.com
Also for dive opps and some great Florida dive site info get your free copy!=
www.scubanews.com
hope this helps I'm going down in a few weeks and man I'm Cranked!!
Dive safe,
Brad