I suspect you will enjoy both your choice of accommodations and dive ops.
IMHO, the majority of BZE diving is about average on the Caribbean Scale. Expect to enjoy it, but not to experience a series of "wow" moments.
Get out to dive the Lighthouse Reef and the Turneffe area sites as often as you can. IMHO, the Blue Hole is a "must do because it's a big name dive," but it's a long boat ride and because of depth it's a short dive. Arguably worth doing only once.
For restaurants, check out Capricorn, Elvi's Kitchen, Red Ginger, Palapa Bar & Grill and the Rojo Lounge.
If there's time, visit the local zoo and also arrange for a cave tubing outing.
Have a great trip.