You can't go wrong with Keanna and her boat - she's also a scuba instructor if you (or maybe the kids?) have any interest - https://corals-reef.com/

For kid friendly stops, I would definitely include the Baths - hiking/bouldering in and out of the water.

Keep in mind July is mid-hurricane season so you might find some of the usual restaurants, bars, and shops closed for the season. You'll also want good travel insurance!