For only 5 days I think you should be looking for a nearby location. Since you are in northern Florida you may not be interested in staying close to home but southern Florida offers great diving and topside attractions - I don't know of any all-inclusives.
If you go to Beaches on Provo in the Turks and Caicos you will be at a huge, all-inclusive mega resort with diving and lots of land-based entertainments included and local shopping available. No cruise ships on Provo either. Long boat rides to the reefs though.
St. Croix has diving and shopping but the only all-inclusive is the Divi resort and it is far away from everything and doesn't have an onsite dive op.
Grand Cayman is safe, beautiful, clean, and has great diving and excellent shopping - and not just in Georgetown - Camana Bay is a beautiful upscale community near 7 Mile Beach that is built around a lovely shopping center. Nothing is cheap in the Caymans, but it is a first world country and offers lots of amenities and attractions, restaurants, nightlife, and entertainments. (Florida, the T&Cs, and St. Croix aren't cheap either - I have expensive tastes!)
As diversteve said the only all-inclusive on GC is Cobalt Coast and it is north of 7MB and rather far away from the shopping and attractions. But Sunset House might work for you, it is on the South Sound just below Georgetown and the 7MB and it offers accommodations, boat diving and unlimited shore diving, and breakfast is included - but you will have to buy lunch and dinner. Cathy Church's studio and photo shop are on the premises and it is very close to Pure Art, a charming shop and gallery packed with handcrafts, artworks, jewelry, and loads of lovely small items:
Pure Art Gallery & Gifts, Grand Cayman, Cayman Islands
Sunset House is also close to The Wharf Restaurant and if you are on-island on a Saturday night you can go and see a show performed by The Barefoot Man. He's very funny, irreverent, and entertaining and popular with us "slightly older folks":
http://www.barefootman.com/
My favorite Cayman all-inclusives are the small, diver-dedicated resorts on Cayman Brac and Little Cayman, but there is not much to do topside besides relax and enjoy nature while in the sister islands. The Cayman Brac Beach Resort has just completed renovations and they have a huge infinity pool and a 2-story beach bar, and they have a small spa, exercise room, tennis court, bicycles, and the resort hosts nightly entertainments like trivia, movies, and bingo (it's actually a lot of fun!) They have a great on-site dive shop and short boat rides to beautiful reefs. Not much night life. It's not a shopping destination either - but plenty of time for relaxing and enjoying the sea and the natural beauty.
I just took a look at the CBBR website and found a 5 night, 6 day trip in mid-july for a diver and non-diver for $2060 total and that includes ocean view accommodations, all meals, 3 drinks per day per person, 3 dives per day for the diver, airport transfers, and hotel taxes and service charges. That doesn't sound bad. The only things not included are dive shop tips and airfare (it is an extra $100 per person roundtrip on Cayman Air to travel to the sister islands - but it is a short hop and you can take a jet to CB).
Good luck!